Reinstalling a Sims 3 Expansion Pack through Origin

Hello, 

I just bought the Sims 3 University Life, and it downloaded through Origin. I installed it. Everything appeared to go smoothly, but then I tried to play it. The pack's logo doesn't appear at the bottom of the Sims 3 Gaming Screen. I'm not able to play any of the features of the expansion pack. Do I just reinstall the expansion pack? If so, I've been trying to figure out a way to do that, but I just don't know how.

If anyone can help, please do. Thanks. Much appreciated.