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‎FlexInstaller/(READ BEFORE USING) INSTRUCTIONS.txt‎

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FLEXINSTALLER - ALL-IN-ONE INSTALLER v3.0
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=========================================
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STEP 1: CONFIGURE YOUR APP
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- Edit Config.cs with your app details
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- Set your Dropbox download URL
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- Customize messages, paths, and options
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STEP 2: BUILD INSTALLER
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- Run build.bat
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- Enter output filename
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- .exe file created in output\ folder
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STEP 3: DISTRIBUTE
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- Just share the .exe file!
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DROPBOX SETUP:
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1. Go to https://www.dropbox.com/developers/apps
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2. Create new app
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3. Upload your program file
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4. Get direct download link (replace "?dl=0" at the end with "?dl=1" to share URL) !!!VERY IMPORTANT OR IT WONT WORK!!!
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5. Put the URL into config
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HOW IT WORKS:
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- Single .exe contains both installer and uninstaller
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- During installation, copies itself as "uninstall.exe"
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- Windows Add/Remove Programs points to uninstall.exe
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- When uninstall.exe runs it detects its an uninstaller and shows uninstall GUI
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- Completely removes app, shortcuts registry entries, and itself

‎FlexInstaller/Config.cs‎

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using System;
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namespace FlexInstaller
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{
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public static class AppConfig
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{
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public static string appName="Sample App";
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public static string appVer="1.0.0";
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public static string pubName="Your Company Name";
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public static string dlUrl="https://www.dropbox.com/scl/fi/TESTURL123?dl=1";
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public static string instPath=@"C:\Program Files\Sample Application";
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public static string exeName="app.exe";
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public static bool showLicense=true;
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public static bool createDesktop=true;
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public static bool createStartMenu=true;
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public static bool runAfter=true;
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public static string welcomeMsg="Welcome to the installation wizard!";
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public static string licenseText=@"
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END USER LICENSE AGREEMENT
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This software is provided 'as is' without warranty of any kind.
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By installing this software, you agree to these terms and conditions.
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1. You may install and use this software on your computer.
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2. You may not redistribute this software without permission.
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3. The publisher is not liable for any damages caused by this software.
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Do you accept these terms?";
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public static string completeMsg="Installation completed successfully!";
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public static bool requireAdmin=true;
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public static string supportUrl="https://support.example.com";
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public static string website="https://example.com";
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}
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}

‎FlexInstaller/LICENSE‎

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FlexInstaller License
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Copyright (c) 2025 iamsopotatoe
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Permission is hereby granted to use this software for personal and commercial purposes, subject to the following restrictions:
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PERMITTED:
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- Use the software to create installers for your own applications
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- Distribute installers created with this software
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- Study the source code for educational purposes
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PROHIBITED:
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- Modifying, adapting, or creating derivative works of this source code
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- Redistributing, selling, or sublicensing this source code or modified versions
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- Removing or modifying copyright notices
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- Using this software to create competing installer tools
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

‎FlexInstaller/build.bat‎

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@echo off
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cls
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echo FLEXINSTALLER BUILDER v3.0
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echo ============================
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set /p OUTPUT_NAME=Filename:
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if "%OUTPUT_NAME%"=="" set OUTPUT_NAME=Installer
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for %%I in (csc.exe) do set CSC_PATH=%%~$PATH:I
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if "%CSC_PATH%"=="" (
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for /d %%F in (C:\Windows\Microsoft.NET\Framework*) do (
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for /d %%V in (%%F\v*) do (
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if exist "%%V\csc.exe" set CSC_PATH=%%V\csc.exe
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)
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)
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)
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if not exist "%CSC_PATH%" (
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echo ERROR: C# compiler not found!
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echo.
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echo Download Microsoft Build Tools:
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echo https://aka.ms/vs/17/release/vs_buildtools.exe
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echo.
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echo Or install Visual Studio Community (free^):
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echo https://visualstudio.microsoft.com/downloads/
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goto :end
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)
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echo Building %OUTPUT_NAME%.exe...
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if not exist output mkdir output
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"%CSC_PATH%" /target:winexe /out:output\%OUTPUT_NAME%.exe /win32icon:src\installer.ico /reference:System.dll /reference:System.Core.dll /reference:System.Drawing.dll /reference:System.Windows.Forms.dll /reference:System.Net.Http.dll src\Program.cs src\MainForm.cs src\DownloadManager.cs src\InstallationManager.cs src\UninstallerForm.cs Config.cs >nul 2>&1
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if exist output\%OUTPUT_NAME%.exe (
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echo BUILD SUCCESS: output\%OUTPUT_NAME%.exe
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for %%A in (output\%OUTPUT_NAME%.exe) do echo Size: %%~zA bytes
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) else (
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echo BUILD FAILED - Check your Config.cs file
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)
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:end
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pause

‎FlexInstaller/src/DownloadManager.cs‎

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using System;
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using System.IO;
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using System.Net;
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using System.Net.Security;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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using System.ComponentModel;
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namespace FlexInstaller {
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public class FileTransferManager
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{
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private ProgressBar barProgress;
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private Label txtStatus;
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private WebClient client;
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private bool finished;
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private bool worked;
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public FileTransferManager(ProgressBar progress,Label status) {
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barProgress=progress;
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txtStatus=status;
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}
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public async Task<bool> RetrieveFileFromCloud(string webUrl,string localFile)
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{
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try {
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if(string.IsNullOrEmpty(webUrl)||!Uri.IsWellFormedUriString(webUrl,UriKind.Absolute)) {
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txtStatus.Text="Invalid download URL";
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return false;
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}
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txtStatus.Text="Connecting to download server...";
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Application.DoEvents();
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ServicePointManager.SecurityProtocol=(SecurityProtocolType)3072|(SecurityProtocolType)768|(SecurityProtocolType)192;
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ServicePointManager.ServerCertificateValidationCallback=delegate{return true;};
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client=new WebClient();
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client.Headers.Add("User-Agent",AppConfig.appName+" Installer v"+AppConfig.appVer);
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finished=false;
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worked=false;
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client.DownloadProgressChanged+=(sender,e)=> {
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barProgress.Value=e.ProgressPercentage;
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txtStatus.Text=string.Format("Downloading... {0}% ({1:F1} MB of {2:F1} MB)",
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e.ProgressPercentage,
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e.BytesReceived/1024.0/1024.0,
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e.TotalBytesToReceive/1024.0/1024.0);
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Application.DoEvents();
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};
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client.DownloadFileCompleted+=(sender,e)=> {
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finished=true;
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if(e.Error!=null) {
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txtStatus.Text=string.Format("Download failed: {0}",e.Error.Message);
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worked=false;
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} else if(e.Cancelled) {
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txtStatus.Text="Download was cancelled";
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worked=false;
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} else {
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txtStatus.Text="Download completed successfully";
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worked=true;
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}
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};
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client.DownloadFileAsync(new Uri(webUrl),localFile);
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while(!finished) {
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await Task.Delay(100);
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Application.DoEvents();
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}
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client.Dispose();
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return worked;
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} catch(Exception ex) {
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txtStatus.Text=string.Format("Download error: {0}",ex.Message);
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if(client!=null) {
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client.Dispose();
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}
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return false;
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}
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}
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public static void Dispose() {
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}
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}
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}

‎FlexInstaller/src/InstallationManager.cs‎

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using System;
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using System.IO;
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using System.Diagnostics;
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using System.Windows.Forms;
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using Microsoft.Win32;
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namespace FlexInstaller
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{
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public class SetupManager
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{
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private string temporaryFilePath;
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private string finalInstallLocation;
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public SetupManager()
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{
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temporaryFilePath = Path.Combine(Path.GetTempPath(), AppConfig.exeName);
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finalInstallLocation = Path.Combine(AppConfig.instPath, AppConfig.exeName);
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}
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public bool CreateDirectoryStructure()
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{
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try
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{
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if (!Directory.Exists(AppConfig.instPath))
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{
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Directory.CreateDirectory(AppConfig.instPath);
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}
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return true;
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}
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catch (Exception ex)
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{
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MessageBox.Show(string.Format("Failed to create installation directory: {0}", ex.Message), "Installation Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
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return false;
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}
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}
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public bool InstallApplication(string downloadedFile)
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{
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try
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{
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if (!File.Exists(downloadedFile))
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{
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MessageBox.Show("Downloaded file not found.", "Installation Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
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return false;
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}
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FileInfo fileInfo = new FileInfo(downloadedFile);
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if (fileInfo.Length < 1024)
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{
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MessageBox.Show("Downloaded file appears to be invalid or corrupted.", "Installation Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
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return false;
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}
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if (File.Exists(finalInstallLocation))
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{
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try
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{
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File.Delete(finalInstallLocation);
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}
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catch
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{
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MessageBox.Show("Cannot overwrite existing installation. Please close " + AppConfig.appName + " and try again.", "File In Use", MessageBoxButtons.OK, MessageBoxIcon.Warning);
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return false;
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}
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}
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File.Move(downloadedFile, finalInstallLocation);
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CreateUninstaller();
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if (AppConfig.createStartMenu)
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{
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CreateStartMenuLink();
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}
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RegisterInControlPanel();
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return true;
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}
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catch (Exception ex)
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{
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MessageBox.Show(string.Format("Installation failed: {0}", ex.Message), "Installation Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
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return false;
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}
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}
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public void CreateDesktopShortcutManual()
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{
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try
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{
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string desktopPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
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string shortcutPath = Path.Combine(desktopPath, AppConfig.appName + ".lnk");
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if (File.Exists(shortcutPath))
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{
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File.Delete(shortcutPath);
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}
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ProcessStartInfo psi = new ProcessStartInfo();
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psi.FileName = "powershell.exe";
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psi.Arguments = string.Format("-Command \"$WshShell = New-Object -comObject WScript.Shell; $Shortcut = $WshShell.CreateShortcut('{0}'); $Shortcut.TargetPath = '{1}'; $Shortcut.WorkingDirectory = '{2}'; $Shortcut.Save()\"",
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shortcutPath, finalInstallLocation, AppConfig.instPath);
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psi.WindowStyle = ProcessWindowStyle.Hidden;
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psi.CreateNoWindow = true;
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Process.Start(psi).WaitForExit();
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}
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catch
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{
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}
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}
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private void CreateDesktopLink()
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{
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}
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private void CreateStartMenuLink()
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{
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}
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private void CreateUninstaller()
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{
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try
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{
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string uninstallerPath = Path.Combine(AppConfig.instPath, "uninstall.exe");
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File.Copy(Application.ExecutablePath, uninstallerPath, true);
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}
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catch
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{
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}
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}
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private void RegisterInControlPanel()
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{
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try
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{
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string uninstallKey = string.Format(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{0}", AppConfig.appName);
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string uninstallerPath = Path.Combine(AppConfig.instPath, "uninstall.exe");
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using (RegistryKey key = Registry.LocalMachine.CreateSubKey(uninstallKey))
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{
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key.SetValue("DisplayName", AppConfig.appName);
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key.SetValue("DisplayVersion", AppConfig.appVer);
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key.SetValue("Publisher", AppConfig.pubName);
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key.SetValue("InstallLocation", AppConfig.instPath);
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key.SetValue("UninstallString", string.Format("\"{0}\"", uninstallerPath));
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key.SetValue("DisplayIcon", finalInstallLocation);
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key.SetValue("HelpLink", AppConfig.supportUrl);
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key.SetValue("URLInfoAbout", AppConfig.website);
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key.SetValue("NoModify", 1);
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key.SetValue("NoRepair", 1);
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}
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}
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catch
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{
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}
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}
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public void LaunchInstalledApplication()
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{
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try
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{
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if (File.Exists(finalInstallLocation))
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{
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ProcessStartInfo startInfo = new ProcessStartInfo();
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startInfo.FileName = finalInstallLocation;
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startInfo.WorkingDirectory = AppConfig.instPath;
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startInfo.UseShellExecute = true;
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Process.Start(startInfo);
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}
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}
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catch (Exception ex)
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{
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MessageBox.Show(string.Format("Could not launch application: {0}", ex.Message), "Launch Error", MessageBoxButtons.OK, MessageBoxIcon.Warning);
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}
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}
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public string GetTemporaryPath()
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{
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return temporaryFilePath;
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}
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}
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}

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