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http://answers.ea.com/t5/The-Sims-3/Sims-3-store-content-will-not-install/td-p/46724
Also keep in mind what MasterW3 said in the other thread that to install content with the Steam version of the game you must have run the launcher via launching the game from Steam. If the launcher opened outside of Steam either for a browser link or clicking on a sims3pack file or something like that it will not install the content. At least for me it won't, so make sure you play the game from Steam and have the launcher open that way before trying to install anything.
If none of that works then the more drastic solution is to follow Man of Wrath's advice from that EA link and just move the entire C:\Users\<your windows user name>\Documents\Electronic Arts\The Sims 3 folder somewhere else (don't delete it though! It has your saves, so just move or rename it). Then see if you can install content from a fresh start that way. If you can then something got corrupted in your old directory and you can just restore the saves and start reinstalling the store content again.