The installation process for Retro Shaders Pro for Godot is relatively straightforward. You will receive a zip file containing all the shader assets in the pack, with a folder called Retro Shaders Pro nested inside the addons folder. Please unzip the file and copy its contents into your own project’s addons folder.
Once the pack has been installed, each effect will be available to you in the Shaders folder, and there is a Demo scene with all the effects on display. There should be no additional configuration required.