Depends what you downloaded.
Besides, it should say it on the site.
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You go to the folder you downloaded the items in, and simply delete them. (The folder is Documents/EA games/ Sims 2/ Downloads)
Sims 2 nightlife gets you the sim modder. I've just downloaded sims 2 nightlife and now I can get it, whereas I couldn't before ^^
The game may be legally purchased and downloaded from the manufactures web site. The Sims is made by EA games.
You don't do that in sims 2 only in the new game - sims medieval.
sadly no, i had over 5000 downloads that i used in the sims 2, but they can't be used in the sims 3