Some people are having issues with zion files downloading so until Mit can fix it, morvis is hosting the files on his site.
All you should have to do is find the proper folder and put the files into them
here's the default directory for the models/texture. The download includes all the models/textures that he has in his folder so it should be a pretty complete collection
C:\Program Files\TheUniversal\Clients\Data\Models
It's a 32Mb download, you can download the files from:
www.a-i-f.net/derek/models.rar