there aren't any 'license board maker' or tileset files included in this.
I made my own A5 tileset simply enough but I can't even search for 'Gimmer License Board Maker' to get a link to the .json converter
My bad, it's a separate section of my github. Forgot to put it into the zip.
https://github.com/gimmer/RPG-Maker-MV-Plugins/tree/master/Utilities/LicenseBoar...
Grab it and the instructions here