public static void SetUpdateCancelledCallback(WinSparkle.UpdateCancelledCallback callback)
 {
     if (Environment.Is64BitProcess)
     {
         WinSparkle.SetUpdateCancelledCallback_X64(callback);
         return;
     }
     WinSparkle.SetUpdateCancelledCallback_Win32(callback);
 }
 private static extern void SetUpdateCancelledCallback_X64([MarshalAs(UnmanagedType.FunctionPtr)] WinSparkle.UpdateCancelledCallback callback);