If you are experiencing download issues on MAC please follow these instructions:
Quit Muse Hub App
Go to Finder
Hold down option while selecting Go from the menu bar at the top of the screen
Select Library
In the window that appears, find the Application Support folder
Inside that folder, find the Muse Hub folder
Delete the Muse Hub folder (the Finder will ask you for permission, allow this)
Empty the trash
Relaunch Muse Hub
Everything should be working again. You'll need to sign in again if you had previously signed in.
Apologies for any inconvenience