That I'm not sure, because I run it on Win8.1 currently without issue. The difference is that I have the Steam version, and, the regular version purchased through Enterbrain. All I can think of, is that it's an issue with the version you're trying to use, not working on Windows 8. My suggestion would be to simply get the new official version from Enterbrain directly; It's pretty damn cheap to get at this point..