How do I use a different sims 3 disc to play?

Okay, so I have the sims 3, sims 3 pets, sims 3 night life installed. My friend let me download the sims 3 pets on my computer, but she needs it to play on her laptop as do I. Whenever I insert the night life to play, it says I need the pets disc. Is there anyway I can set it so that I only need the night life to play? Thanks.How do I use a different sims 3 disc to play?
Unfortunatly not. I believe that the last disc/expansion you install is the one you need to use to play. You can try reinstalling the games in a different order and see if that helps, if not you're just going to have to buy one. If you look around, you could probably find one for $20-$30How do I use a different sims 3 disc to play?
Great. I can't reply, but you can play the games. You need to load Late Night w/ the disc. With Pets installed, it'll work out.

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How do I use a different sims 3 disc to play?
If you uninstall pets you would be able to use your nightlife disc but of course you would lose anything related to pets...