Sims 3: Pets, asking for game disk.

Hello.

I'm new in here and i got a problem. I've downloaded Sims 3: Pets from you, and first the launcher just opned and just shuted down again. So i followed the four step ind the "Must read how to install the sims 3 correctly" thread, and the problem with the launcher is gone but now the game is asking for the game disk for the Sims 3: Pets.. What should i do?

I fixed the problem now Haha.