Add update handling for zip files

StabilityMatrix.Core/Updater/UpdateHelper.cs

@@ -61,15 +61,39 @@ public class UpdateHelper : IUpdateHelper
         UpdateFolder.Create();
         UpdateFolder.Info.Attributes |= FileAttributes.Hidden;
 
+        var downloadFile = UpdateFolder.JoinFile(Path.GetFileName(updateInfo.Url.ToString()));
+
+        try
+        {
             // download the file from URL
             await downloadService
                 .DownloadToFileAsync(
                     updateInfo.Url.ToString(),
-                ExecutablePath,
+                    downloadFile,
                     progress: progress,
                     httpClientName: "UpdateClient"
                 )
                 .ConfigureAwait(false);
+
+            // Unzip if needed
+            if (downloadFile.Extension == ".zip")
+            {
+                await ArchiveHelper
+                    .Extract(downloadFile, UpdateFolder, progress)
+                    .ConfigureAwait(false);
+                await downloadFile.DeleteAsync().ConfigureAwait(false);
+            }
+            // Otherwise just rename
+            else
+            {
+                downloadFile.Rename(ExecutablePath.Name);
+            }
+        }
+        finally
+        {
+            // Clean up original download
+            await downloadFile.DeleteAsync().ConfigureAwait(false);
+        }
     }
 
     private async Task CheckForUpdate()