So, further to the ordeal I had over the weekend with Windows 10 not installing on a perfectly good laptop, the client brought a brand new laptop.
This one had Windows 10 Home in S mode installed, a new kind of hell.
I could not install the application on this laptop because S mode prevents that.
Apparently, one has to connect to the Microsoft App Store to switch off S mode.
Which means, I think, that one has to create a Microsoft Account just to disable S mode to install a program.
Linux geeks doing what Linux geeks do...