You need to register the worlds first by using the sims 3 web to redeem code. Scroll down to the bottom of the web to redeem code http://store.thesims3.com/
After you redeem the code log out of your account. Clear your internet browser history, Use Firefox or IE the sims web may give you issue if using Chrome or Safari. Log back into the sims 3 web. Don't log into the sims 3 web through your launcher, log onto the sims 3 web while you are directly on the web. Once you do that run your mouse over the store, run your mouse over my store account and click on purchace history. Your items should be there. Just click download and your launcher will automatically open.
