6.0.20 is now on the download page. Thank you Steinberg.
Re the Download Assistant (which fails to open on my editing computer as well as a recent model laptop - both latest updated W10), I went to lodge a support ticket but found out that because I am not in Europe or the USA, I was referred to a local Yamaha distributor (Australia), but the AU website simply referred me back to MySteinberg where I had already been directed to Yamaha AU. Going around in circles! In practice, it seems that if you’re not in Europe or the USA, there is no readily accessible technical support from Steinberg.