For mach4 the best MPGs seem to be the ones from VistaCNC. Most of the Mach3 ones DO NOT work with Mach4.
I had the same problem the first time I tried installing. I can't remember what I did, however I will look in the morning to see if I can refresh my memory and let you know.I have the vistacnc M1 pendet and I've copied the two plug and files to the a mach 4 plugin folder and when I go to config/plugin in Mach4 the pendant is not listed what am I missing. I've also run the vistacnc mach4 firmware update for the pendant so I'm totally lost right now