I've worked on Smutbase models before. You could do two ways to get the textures, you can go to Texture Paint and save every texture you can find on there that way going down one by one or (if its missing PNG textures and its mostly just colors) you can bake the nodes into a PNG texture. Sometimes it works, sometimes it doesn't.
But that's how I personally get textures. Or just make my own if I'm feeling really lazy.