Roller Coaster Tycoon Download?

I'm looking for a torrent download of Roller Coaster Tycoon (the original), but all I can find are ones that you have to mount to a CD. I know what I'm doing on a computer, but when it comes to that kind of stuff, I'm puzzled. Is there just a simple download that I could use? I do remember downloading it a while back, but I can't remember where from. Help!