I did as you recommended, it said that all the files were already up-to-date. It didn't give me an option to repair. But when I ran the program I was able to click the "Use Demo" button, but then it locked up again. I read what Jennifer had to say about using the X-Plane beta version, and I think I will wait for the completed final version of X-Plane 11. Since I don't see a way to uninstall this beta program I intend to just delete all the files. Thank you for trying to help me with my problem though.