It's easy to get caught up in the stigma of hacking. You might think, no one is going to consider this legitimate testing. Well, there's really no difference between us and the developers who need test environments to make sure their software and sites function properly. Microsoft actually lets you download full Windows VMs for free. What's the catch? Well, they won't have all the bells and whistles that would make it easy to turn one of these testers into your own personal copy of Windows. Also, they expire: in the case of the Edge test VMs, they're licensed for 90 days. You can usually renew the license, though:

What's great about this nifty option is that Windows 7, Windows 8.1, and Windows 10 are all available. You can find them at: https://developer.microsoft.com/en-us/microsoft-edge/tools/vms/.