If you get a message on the left bottom corner of the MP Host that the license is invalid it means that the mph.license file was not generated for that computer.
If you have copied the hardware.id or the mph.license file from another computer (perhaps using the Mac Time Machine) delete both the mph.license and hardware.id files and run the MP Host in the DAW to create a new hardware.id file.
Unload any instances of the MP Host and then load one MP Host in the DAW to create the hardware.id file.
Then, log on your user portal account (see email when you purchased the MP Controller) and upload the hardware.id file to generate a new mph.license.
The hardware.id and mph.license files should have these 2 exact names.
See these 2 related articles:
21. Activating the MP Controller on other computers
22. Get the mph.license from the user portal
Note that you can get to the MP/Host folder using the right click menu. See here
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