They have a new version out for beta testing. It looks like they've had recent complaints about compatibility. Like people that didn't have a joystick. And some people that applied recent OS patches were having problems. The new beta test one purports to solve those problems. I didn't try it because the version I got a few days ago works great on all of my machines. But if you had trouble you might try the beta. It's at https://sourceforge.net/projects/linuxaircombat/files/Choose...