I'd also suggest you uninstall the version of Bodyshop you just downloaded. That version is bugged either way (see
here for what I'm talking about, mainly the first item addressed), and was supposed to be available only to make sims before the game was ever released. Use the version that comes with the highest/latest
released EP you have, like theraven mentioned, and you'll find your custom Bodyshop content where it's supposed to be.

If you don't know where to find it, look in your
C:\Program Files\EA GAMES\The Sims 2 (*Name of latest EP*)\CSBin directory, then double click on the file
TS2BodyShop.exe to open up Bodyshop. :angel:
(...and moved to help section. Still might be more of a WCIF question, though. I'm having a "ditz" moment...

)