If you prefer the old workflow, the mtllib.exe tool is still available for manual downloads of the legacy library. However, the official Chaos documentation recommends the Cosmos Browser for the most up-to-date and optimized assets. V-Ray Material Library - V-Ray for Rhino - Chaos Docs
: Open the V-Ray Asset Editor and click the arrow on the left side to see the material categories, or launch the Cosmos Browser directly.
Master Your Workflow: The Ultimate Guide to the V-Ray 6 Material Library
Whether you're an architect or a 3D artist, the transition to Chaos Cosmos