hi @digconart ,
Unfortunately, as confirmed by James Pullan from the Epic staff, MetaHuman Creator is not currently supported on macOS. It is only officially available for Windows, according to the published minimum requirements.
But a user mentioned that on Mac, you can download 5.5 and below MetaHumans using Quixel Bridge, and then just search their name in the browser and the BP file is the character as exported from Quixel Bridge.
Hope it helps!