Is the blender file supposed to come untextured? I can't seem to get the objects to take on the textures like you have demonstrated in the screenshots. I'm pretty new to this so I was wondering if you could let me know, thank you!
Yeah; the models have slots for each material they can use. You'll need to make a material for each texture you want to use, then put those materials in the slots on the model renderer :) This way you can mix and match, re-texture existing assets etc.