The shader make use of the Asset Browser, which you can safe to your user library and easily drag and drop to any 3d project you are working on.

You will receive three Blender files: A full catalogue view, a monkey demo scene, and the flares scene. Both the full catalogue view and monkey demo scene files contain the full shader collection in the Asset Browser.

The full catalogue view file enables you to see all of the shader in the 3d viewport, but as a warning it might be very tasking for your computer.

Meanwhile the monkey demo file contain only two 3d models for you to experiment and play with the shader, making it lighter for your computer.

And the last file is the flare scene for you to play around and experiment with the flares. (This file doesn't contain any shader collection in the Asset Browser)