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I've got a Windows XP virtual machine on my Linux desktop computer exactly for a similar reason. I start it when needed and close it.

And of course it's not connected to Internet.

I can relate to your pain, in Canada the overwhelming majority of accountants use Sage 50, which has a burgeoning cloud version but still lives as Windows software.

I got an accountant instead of switching away from macOS. Made more sense.

Agreed, and hardware support is another one. For PC hardware (and software as well), the de-facto standard platform is Windows.