I purchased the CD version 1.0 of X Class World on 4/29/2010. How can I find if there are any updates to that version since then?
There aren't, the CD includes all the latest version of all XClass products released so far.
I also note that the readme file says that this software is for FSX and windows XP only. Does that mean I will have problems if I install it on my Windows 7x64 system? If so is there an updated version for newer systems?
The readme was of course written way before Windows 7 was released so, it couldn't know about future OS. However, all products sold here works fine with Windows 7 x64. We all use Windows 7 x64 when testing.