UseHub
I see I’m not alone having difficulties with MuseHub.
On MacOS 10.15.7
After downloading, it pukes if you try to run it from the /Applications folder.
Right click to show contents, in Folder “MacOS”, open “MuseHub” and get a terminal plus the Download choice window.
Select what you want, and away it goes.
All good.
As well the DLrates are great.