go copy your downloads folder... paste it to your desktop...
now go and delete the downloads folder (in your documents/ea/sims2/ folder)
delete the downloads folder ONLY!
now copy the downloads folder on your desktop. Paste it into your documents/ea/sims2/ folder!
should work now! it did for me!

This is not needed. Every time an EP is installed the game sets your CC to be DISABLED by default. You must go to the game options, click the asterick to bring up the CC dialog, enable your CC, then CLOSE the game and reload it.