Look for member FunGt. He has a site w/ backups for the data files.
Your post didn't really show the problem, but it sounds like a missing texture map, so you just get a blank model. I'll presume
your computer meets the hardware requirements for VC, but if your video isn't, you'll get the same problem.
chris82's suggestion sounds like the easiest way to fix your IMG file. Start w/ the original IMG & start changing the models
(X.DFF & X.IMG) one at a time & save a copy of the IMG file each time. Load the game & see how it looks. If it's good, go
to the next model. The IMG is a huge file, so once you know your mods are working, you probably want to delete the older
back ups.
Good luck.
EDIT: Welcome to TGTAP, look around & check out the rules. Enjoy.