HOW TO USE

Just extract the zip file, and copy the .blend file to a place your Asset Browser can access it. Then, it's just a matter of drag-and-drop via the Asset Browser in any project of your choice. 

HOW TO ACCESS ONLY THE TEXTURES

Go to File > External Data > Unpack Linked Libraries, and select a folder you'd like to unpack the textures to. 

HOW TO STACK MULTIPLE SHADERS FROM THE PACK

First, make sure that the two shaders you want to use are already in the scene, even if they're not being used. The quickest way is to simple drag-and-drop them onto the object. 

Second, go to the Node Editor, and create a new material. Delete the Principled BSDF and add an Emission node. If you see Add > Group, you will notice those particular shader node-groups in there. Simple add them into the Shader Editor, and connect them with a Mix RGB node before plugging it back into the Emission node.