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.
: For a version that may require unzipping to access all presets (including Extreme), check the Chocapic13 V9 general file . Installation Guide [1.19.x] Download Chocapic13 V9.1 Extreme PBRtest2
: Often recommended for better performance. Download the Iris installer . Locate the Shader Folder : Open the Minecraft Launcher and click Play . Go to Options > Video Settings > Shaders (or Shader Packs ). If you are looking for specific "PBRtest" versions,
Click the button to open the directory on your computer. Add the Shader : Go to Options > Video Settings > Shaders (or Shader Packs )
: Download and install the version for 1.19.x from the official OptiFine site .
Drag and drop the downloaded .zip file for into this folder. Activate :
Return to the game, select from the list, and click Apply or Done .