SIMS 3 PLUS PETS

Bought the game off of a friend,
its the Sims 3 Plus Pets edition, with both the regular download of the sims 3, and the Pets expansion pack on one disk.
Downloaded sims 3 first off, the base game everything is fine but now I cannot find where to download the pets expansion pack to add to the game.
I have redeemed my online Pets code, but at the bottom of the sims 3 Launcher, it only says I have the base game downloaded. nothing else.
Help?