AvalonGUIConfig.updateCheck.extractAndCleanup C# (CSharp) Метод

        static void extractAndCleanup()
        {
            if (System.IO.File.Exists(optionDownloadPath))
            {
                if (Path.GetExtension(optionDownloadPath).ToLower() != ".zip")
                {
                    if (Path.GetFileNameWithoutExtension(optionDownloadPath).ToLower().StartsWith("avalonpatch"))
                    {
                        //Lets run it
                        if (File.Exists(optionDownloadPath))
                        {
                            ProcessStartInfo upgradeProcess = new ProcessStartInfo(optionDownloadPath);
                            upgradeProcess.WorkingDirectory = Path.GetDirectoryName(optionDownloadPath);
                            if (AvalonGUIConfig.patchUtilityRunUnattended)
                                upgradeProcess.Arguments = "/unattended ";
                            if (AvalonGUIConfig.patchUtilityRestartMP)
                                upgradeProcess.Arguments += "/restartconfiguration";
                            System.Diagnostics.Process.Start(upgradeProcess);
                            Application.Exit();
                        }
                    }
                    else
                    {
                        // Not a zip so can't process internally - download to desktop and set flag so we can inform the user to exit MP and manually install the update
                        System.IO.File.Copy(optionDownloadPath, Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), Path.GetFileName(optionDownloadPath)), true);
                        System.IO.File.Delete(optionDownloadPath);
                        AvalonGUIConfig.manualInstallNeeded = true;
                    }
                }
                else
                {
                    FastZip fz = new FastZip();
                    fz.ExtractZip(optionDownloadPath, destinationPath, "");
                    System.IO.File.Delete(optionDownloadPath);
                    AvalonGUIConfig.manualInstallNeeded = false;
                    // Now check what we have and copy to the right places.....
                    AvalonGUIConfig.checkAndCopy(destinationPath);
                    Directory.Delete(destinationPath, true);
                }
            }
            pBar.Value = 0;
        }