Your downloads don't go into your documents folder, like in Sims 2. They actually go into your program files. If you have Windows 7 or Vista, it would be Computer > C: > Program Files (x86) > Electronic Arts > Sims 3 (or your latest expansion) > Mods > Packages (under that folder would be your resource file)
All your content would go in the packages file
All your content would go in the packages file

Still nothing +___+ .... I tryed EVERYTHING! nothing is working : ((((((((((((((