I tried figure out how to get the models, all the links were dead, but i poked around and i think i found it. I don't recignize the formats tho.

1. Download this 1.3gb package

https://sourceforge.net/projects/ufoai/files/UFO_AI%202.x/2.5/ufoai-2.5-...

2. find the file at the path: ufoai-2.5-data.tar > base > 0models.pk3

3. the .pk3 is a .zip file, just change the filetype extension to .zip

4. models will be in: 0models.zip > models > civilians

Yes, someone should probably ask for permission from the original creator to get the models upload OGA.