I had the same problem too. I bought a Sims 3 Worlds Bundle, two discs but when I tried to install them, the codes didn't work... Luckily I solved it...
Step 1: Go to the Sims 3 website (sign in)
Step 2: Go to your Store Account.
Step 3: Click on the "Redeem a Code" link.
Step 4: Enter your code.
Step 5: Go to your purchace history.
Step 6: Your game should be with the rest of your items/worlds that you purchaced.
Step 7: Download your game.
Buying the dsics were pretty much a waste of time. I coudl've bought them online. Oh well...
Hope that this works! 🙂
