Tutorial 1: Influence Maps: https://youtu.be/dFsIlhwgOHY
Tutorial 2: Cavity and Edge Wear: https://youtu.be/tQjemN9z18Y
How to install, quick guide:
There is a full guide in the download section
Download the addon .py python file and install it like any other addon: Edit>Preferences>Add-ons>Install.
Download the files .ZIP and unzip it in any folder you like. Remember where you put it.
In the addon preferences, under Edit>Preferences>Add-ons>SMUDGR, paste in the file path where you put the unzipped files and press 'update images'.