Latest versions of the game are now fully extractable with specific script. First post is updated with respective info.
I just noticed the game is using unusual approach for materials - most models are consist of a single mesh section with single material, but it has multiple separate textures for mesh parts (like legs, body, etc). Usually you would expect a material per section with single layout per section (diffuse, normal, specular textures and so on), at least in UE games. I wonder how it works from UVs side, is umodel producing them correctly in such cases for manual textures applying in Blender or somewhere