On textures.com the brushes are not free, are premium now…
I just used one of the albedo’s from a regular rock PBR and it worked pretty good for me. The one I used was “rock cliff mountain”.
Your provided link is strange, please re-edit your post!!!
Ive edited OP to point to textures .com which I assume is the correct one
1 Like
Thank you! 
1 Like