Remove the 4 hour Delay to download new Firmware (#80)

***NO_CI***

Author: alberk8

nanoFirmwareFlasher/FirmwarePackage.cs

@@ -144,17 +144,7 @@ protected async System.Threading.Tasks.Task<ExitCodes> DownloadAndExtractAsync()
                                    .ToList();
             }
 
-            if (fwFiles.Any())
-            {
-                // get file creation date (from the 1st one)
-                if ((DateTime.UtcNow - File.GetLastWriteTimeUtc(fwFiles.First().FullName)).TotalHours < 4)
-                {
-                    // fw package has less than 4 hours
-                    // skip download
-                    skipDownload = true;
-                }
-            }
-
+           
             if (!skipDownload)
             {
                 // try to perform request
@@ -321,8 +311,20 @@ protected async System.Threading.Tasks.Task<ExitCodes> DownloadAndExtractAsync()
 
                 if (fwFiles.Any())
                 {
-                    // take the 1st one
-                    fwFileName = fwFiles.First().FullName;
+                    if (string.IsNullOrEmpty(_fwVersion))
+                    {// take the 1st one
+                        fwFileName = fwFiles.First().FullName;
+                    }
+                    else
+                    {
+                        string targetFileName = $"{_targetName}-{_fwVersion}.zip";
+                        fwFileName = fwFiles.Where(w => w.Name == targetFileName).Select(s => s.FullName).FirstOrDefault();
+                    }
+
+                    if (string.IsNullOrEmpty(fwFileName))
+                    {
+                        return ExitCodes.E9007;
+                    }
 
                     // get the version form the file name
                     var pattern = @"(\d+\.\d+\.\d+)(\.\d+|-.+)(?=\.zip)";