Hi Pulsar, after browsing posts I found it here --> https://magic.mecanography.fr/installing/
Thing is, it "works" kind of, AMT is showing into MIDI setup - BUT - it's not working well on my brand new Mac Mini M1, i.e. I cannot play multiple notes on my keyboard...
It's a first step, but I bought a Mac Mini to work faster and in the end I have to connect my piano to my old mid 2014 mac book pro ... such a pain...