**In some people the archive may be corrupted. Yours can download it from the alternative link there. (Google Drive link); https://drive.google.com/drive/folders/14HB5UOcZMOb_G1WC3dgVFxmQ-06UmanG?usp=sharing

or

https://drive.google.com/open?id=1w_CGyp4zpKIlT751X8Tv76_QhPDr01Fl

High resolution rock brushes, file format; .zbp and .psd (alphas). Alpha Maps 2048×2048px use with: ZBrush use with alphas: Mari Substance Painter Substance Designer Blender Quixel 3Dcoat 4Dcinema Mudbox more+ ** all alphas tileable