It should work fine. I've literally got a half dozen installs of CK2 for different versions, and some even sitting on an external hard drive that I sometimes plug into my laptop. It runs without problems.
Thanks just as well. Good to get these confirmations. Well maybe it works on my old PC, but that one needs some work to do on it..so i refrained from trying it up 'til now. Kinda lazy on my behalf i guess.