Sims taking up too much room?

So I downloaded sims 3 and 12 expansions for a total of 13 torrents from piratebay using bittorrent. Everytime I download a expansion from the mounting It adds another 3GB or so on top of the initial 5GB give or take I downloaded from piratebay. Do I need enough room for the initial download from piratebay and the download after you put the cd key in. Or can I delete the piratebay download after I do the cd key download to clear up some room.

After installing you can delete the setup files if you want, though if you ever have to reinstall you'll have to download it again. The best option might be to invest into a hard drive dedicated to downloads - hard drive space is cheap these days for most places around the world.