It should be allowed to reinstall the game because X1 has a few small changes to already existing things in Uru.
What you can do to protect yourself from losing your progress is find your "sav" folder and keep the saved game file. Remember where it is, and then create that same folder and put the file into it, in the X1 folder.
Hope I'm making this clear... lol.
Anyway, that should do it.

Let me know if you need more help Susan.
Good luck!
