Hello. I’m watching an anatomy course from Ryan Kingslien. For modeling, he uses textures for Shadow Box there, but I can’t find them. Please help
C:\Program Files\Pixologic\ZBrush 2022\ZTools\ShadowBox\SBRef.PSD
I assume the equivalent in 2023
This is the standard Shadow Box texture, I mean the textures from the course as in the picture below. Where can I get them? 
Sorry, no idea. Perhaps ask the author. Maybe even draw them yourself. Good Luck.