Hmm well CS3 definitely beats CS2 however I still have both and SD I have been using CS3 as long as sperm has and so far it didn't cause any problems for me and yes i have the windows version.
So just install it sperm already posted my way of cracking it without any crack and tet also knows how to do it.
Shame is you have to copy pasta all your existing brushes into the the brushes folder in CS3 and have to load them again .
Ohh and all the plugins you got on CS2 will also not be transferred to CS3.
So chances are that you will be using both but after getting used to CS3 you will want to ditch CS2 completely.