I've had a retail copy of RollerCoaster Tycoon 3 since it first came out, which was several years ago. It's a great game. I don't play it as regularly as other games, but I still love it.
The other day there was a Steam Daily Deal on RCT3: Platinum (RCT3 + Soaked! + Wild!). I went ahead and grabbed a copy because I don't have the expansions, there was no way to purchase each individual expansion via Steam, and 10 bucks seemed a good deal in my book anyway. Also, I like the Steam platform.
My save games and other data are probably going to be compatible two expansions up, so I'm not worried about those, but what do I do with my existing RCT3 installation itself? Do I need to get rid of that first before having Steam install RCT3: Platinum?