I have SimPE 0.72.1, Sims 2:UC, and Windows 8.1. SimPE works fine with extracting base game body meshes, but won't extract other expansion/stuff pack's meshes. I did some digging in my SimPE preferences and found that it didn't link to all the right directories. I got the correct file paths and everything set up, clicked ok - and then shut down SimPE to reopen another file. Things still didn't work so I checked my preferences again and found that everything was unlinked again! Same goes for my NVIDIA utilities - this is what I was trying to link in the attached pic.

I tried to use Slig's fix for UC, which linked something in my preferences, but not the correct packs.

I'm a little bit frustrated at the moment, and I can't find help for this problem on Google or here on MTS. Any help would be appreciated!