Hi John,
Parallels is not the only virtualisation software out there. I regularly use 'Virtual Box' on my Mac for testing things out. It's a free download from virtualbox.org - just remember to grab the extension pack as well so that you have proper USB support.
You can download an installation ISO of Windows 10 from Microsoft. It will whine and complain about not being able to register itself, but will still run perfectly.
These two should be enough to get you up and running.
Cheers,
V
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