It seems the issue is related to Firefox v58.0.2. Using Opera v51.0.2830.34 no problem at all. :dunno:
Surf here and search for "Microsoft Windows and Office ISO Download Tool".
It lets you download iso images (Win7, 8, 10) from MS servers.
From Bitwig Q&A:
The mapping is: (Letter to pitch (and enharmonic equivalents)) A=C, W=C#,S=D,E=D#,D=E, F=F, T=F#, G=G, Y=G#, H=A, U=A#, J=B,...
More info here
Separate names with a comma.