How do I install the package? 

Unzip the file EEVEE_Shaders.zip in a location you prefer.  Don't change the internal folder structure.  Open Blender 2.80 and navigate to the unzipped EEVEE-shaders folder.  In the folders Shaders_L1, Shaders_L2, Shaders_L3 and ShadersAdv you will find the Blendfiles containing scene with the material in the neutral environment and albedo grey card.  You can also append the materials in Blender if you only want to import the materials.  

The blendfile NormalMakerBaker is to bake normal from the bottom plane to the top plane.  Documentation will follow later.   

With the blendfile NormalMixer you can blend or mix the normal textures if you need more normal maps.  

Some tutorials related to this product and where this product is used:

• Bump Maps VS Normal Maps in Blender 2.80 EEVEE
• Designing materials in EEVEE - Biggest mistake demystified
• Saving memory by using more textures per material
• How to use the advanced shader (adv) of this package.