The models need to be resized, whether in TG or outside, and they need their shaders fixed as they seem to be using example colours in the ones I tested. Of course the parts are unnamed so should use poseray. If you test without fixing in TG a scale of 0.005 min and 0.0075 max seems to work nice with cameras 10 meter height.
So far their freebies seem to have issues with packages which may be why they are free. Hopefully not representative of their products.