Reposting from the other thread. This is an issue specific to the Steam version. Last week and update hit that is not installing the Windows registry entries properly for the last 5 packs. You will either need to manually add those entries yourself or play the Origin version.
-----
There is a problem specific to the Steam version of the game where early last week after the 70s 80s and 90s Stuff launched some update was made that accidentally removed registry entries for the last 5 packs or was no longer installing them properly. You can manually add the entries yourself. See here for more info:
http://steamcommunity.com/app/47890/discussions/0/846943514132091361/
If you still can't make that work then wait for a fix and hope Steam notices the problem at some point or make sure all your packs are registered to sims3.com and then redownload and reinstall everything through Origin.
I tried reporting the issue to Steam's support but they are very dense and are not getting it. They told me to check EA's support site or the forums but the problem is specific to the Steam version of the game and is definitely on their end.
