Ok so I tried installing Sims 3 High-End Loft Stuff but when it's done installing, and I try to run it like any other game, an error window comes up and tells me a file is missing from my library. I did update the base Sims 3 game while installing this expansion.

I decided to do a system restore back to a date before I installed the expansion. Now the sims 3 base game is working just fine. I really want to use high-end loft stuff but I'm super afraid to try installing it again. Can anyone recommended me something? I'm in need

Thank you all