Unable to open Sims 3 Late Night - launches Generations instead

Hi! I just downloaded Sims 3 Generations and Late Night.

I installed Generations first, all according to the Mac fix posted in the forum. It opens fine. However, then, I installed Late Night, and instead of opening that when I click the thumbnail, Generations starts up. The same goes for Sims 3 - instead of opening the base game, Generations starts. I think I followed all the instructions perfectly, and I updated everything, so I'm not sure what's happening. Help?

Generation is going to open up as it's the latest expansion.

Okay. So... does that mean I can't play Late Night with both installed? Only the most recent expansion pack opens?

Thank you!

Basically.. You have the sims3 base game, then you install expansion packs to get extra game content. So when you launch the sims 3, the generations launcher may appear but when you play the game you will also get the Late Night content within the game when you play it. I hope that makes sense.