Once you have purchased Extreme PBR from Gumroad or Blendermarket download the addon (From orderpage) “extreme_pbr.zip” don’t unzip it!
Attention! Make sure you have downloaded the file in “.zip” format If you are a Macintosh user and are using Safari, be aware that safari automatically decompresses .zip files So take 1 minute more time, and use Mozilla Firefox, or Google Chrome to download your zip files
- BlenderMarket: https://blendermarket.com/account/orders
- Gumroad: https://app.gumroad.com/library
Once downloaded go to: Edit -> Preferences