@Vasja1st I think that's normal because an unknown developer is providing it. I found another version of the game on GitHub that runs with better graphics, 60 fps, and 16:9. Windows complained about that one too, but I started it anyway. And the game runs very well. Except for something wrong with the spy unit. With the latest version, it often doesn't want to lay mines; it drives to the spot and then simply drives back without laying the mine.