It is optimized for use with KIT OPS , allowing for a "drag and drop" workflow.
correctly in your Blender Asset Browser.
V9.1 is an older release; the system has since been updated to V9.3 and beyond.
Most materials are designed to be applied without requiring complex UV unwrapping.
for photorealistic materials (like AmbientCG or PolyHaven). Configure EEVEE settings to match Cycles-level realism. EEVEE + Cycles Materials System - chippwalters
Official versions are sold on Blender Market and Gumroad.