: Download and install the version for 1.19.x from the official OptiFine site .
If you are looking for specific "PBRtest" versions, these are often experimental builds. If the standard Extreme version does not include the PBR features you need, check the developer's official Discord or GitHub (if available) for unstable test branches. [1.19.x] Download Chocapic13 V9.1 Extreme PBRtest2
Drag and drop the downloaded .zip file for into this folder. Activate : : Download and install the version for 1