More Unity issues

Unfortunately Unity is not in any way backwards compatible. Older versions don't read files made on new versions, and new versions don't read files made on old versions. This is extremely frustrating. The version number of Unity does not appear in the program's properties, so the only way to check is by opening Unity. However, the last time I opened it in college was to view project files I created using files I created at home, with the result that it won't open now because it can't open without a compatible file. So now I have to do some detective work!