Sounds install location disregarded
I've chosen a folder on an external drive as install location. It clearly indicates this folder in Muse Hub, however there's nothing there. I made sure to change this location prior to downloading sounds, as there's little room on my internal drive.
So...I find the files in the hidden "Volumes" folder on my Mac. Same path as to the external drive, but obviously not on the actual drive. It seems the Hub refuses to install to an external drive?
The Hub can install to the external drive, but MuseScore would be unable to find those sounds there.
Make a symlink from your internal drive to the external drive; then configure Muse Hub to use that symlink as path.