Change CC game version?

I don't know if there's a way to do this. I've searched google but found nothing.

Basically, I have some sims and lots I downloaded from tumblr. They show up in my game fine, but it won't let me place them. It says they were created with a newer version of the game and that I should update.

I don't want to update until Seasons is out, so is there anyway to get around this and place the lot anyway?

I hope this makes sense. Thanks for any help!