Read the reviews. Humanify from the same vendor also has problems.
I'm not going to knock their work but they should have offered a demo instead of letting customers down buy telling them they are going to fix the issues with a Pro version.
With a respone like that I'd stay away from that product.
We could. It's better to learn Blenders shading system IMO. Gives you more power to get the results YOU want instead of relying on a broken add-on 🙂