Hello, As an example, I've purchased the Orb_Brushpack (which works) and the JRO_Rock_brushes pack (which doesn't seem to work) I've downloaded the zip, extracted it in the following folder: C:\Program Files\Pixologic\ZBrush 4R8\ZBrushes The Orb pack works beautifully (as seen in the first image). But non of the alphas…