Cant install from drive D: but can install if I copy the file to drive C:
Download to drive D: (I am using Chrome and my home is on my drive D:)
Run the .msi (it starts up fine)
Select that I wish to install to D:\Program Files\MuseScore 3
Click next and the install fails claiming it cant access the installer file (the .msi)
If I copy the .msi to my drive C and run it again it will install OK (to D:\Program Files\MuseScore 3).