But the point is, and which I should have been alert to, that "Barebones" means just that, ie NO operating system at all, just a BIOS. I had to download and install a copy of Win 10 Pro from the Micro-$-Oft site. Only finding out that it was activated and linked to the Micro-$-Oft account I set up with the Win 10 Pro license on the micro PC I'd bought earlier for the platform telescope.
Well, I now have a bootable USB stick with a Win 10 Pro installation file on it, and a spare, never expiring, license key "just in case".
Now also installed Cartes du Ciel, Autoslew, Sequence (From the ASA support pages), ASCOM 6.4 sp1, and Maxim DL6, just got to purchase another license of PinPoint.