Hello!
You are looking at rethinking-voxels, a minecraft shaderpack. It is an edited version of Complementary Reimagined, and it follows the same visual style, but it also has coloured lights.
To install this shaderpack, you need to have minecraft 1.19.2 and a shader loader (either Iris (recommended) or OptiFine). Please do not report bugs that occur when running the shaderpack on testing versions of either shader loader.
Once you have a shader loader installed, you can either clone this repository into your shaderpacks folder, or, if you are viewing this through the github repository's webpage, click on the green button labeled Code, then select the bottom-most option called Download ZIP and place the downloaded file into your shaderpacks folder.
you can find your shaderpacks folder by opening minecraft with Iris or OptiFine installed, navigating to Options -> Video Settings -> Shader Packs -> Open Shader Pack Folder. If you are using Iris, you can also drag-and-drop the zip file in the shader selection menu to install it.