FIX: Allow installer to upgrade version

Author: kornys

CliNetliteInstaller/Product.wxs

@@ -1,18 +1,24 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<?define version="1.0.0"?>
+<?define UpgradeCode="a580c04f-caec-4e18-9134-c4b8f1c8f1be"?>
 <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
 	<Product Id="712c71fd-c6f1-41a6-a634-b6d0a8769002"
            Name="cli-netlite"
            Language="1033"
-           Version="1.0.0.0"
+           Version="$(var.version)"
            Manufacturer="David Kornel"
-           UpgradeCode="a580c04f-caec-4e18-9134-c4b8f1c8f1be">
+           UpgradeCode="$(var.UpgradeCode)">
 
 		<Package InstallerVersion="200" Compressed="yes" InstallScope="perMachine" />
     <Media Id="1" Cabinet="clinetlite.cab" EmbedCab="yes" />
 
     <WixVariable Id="WixUILicenseRtf" Value="/LICENSE.rtf" />
 
-		<MajorUpgrade DowngradeErrorMessage="A newer version of [ProductName] is already installed." />
+    <MajorUpgrade
+      AllowDowngrades="no" DowngradeErrorMessage="A later version of [ProductName] is already installed. Setup will now exit."
+      AllowSameVersionUpgrades="no"
+      Schedule="afterInstallInitialize"
+      />
 
     <UI>
       <UIRef Id="Custom_WixUI_Minimal"/>