I got tired of the then and the upcoming problems with VirtualBox so I started to use QEMO/KVM for my unfortunate but necessary use of some windows apps for my genealogy work.
I did lost my copy and paste function, but I can live with that.
But the virtual windows in QEMO/KVM is connected to Internet and I don't want that, no need for updates and so, much better with a "closed box"
How do I stop windows client from reaching internet?