Hi @Pabs and @garriola83, i'm reinstalle this plugins on a fresh install (Zbrush 2020) and no problem or errors. Have you install it on the ZPlugs64 folders ?
My first critique is use reference. There's anatomical errors. The angle that the bulge of the sides of the shins make is wrong. From the outside in, it's high to low.
after a couple of trial and errors i decided to make basic shape first. And then modify it to something different. It's kind of my way of concepting:))