Use a Windows 7 product key. Enter it when installing the matching version of Windows 10. As of today, this still works. Do not pay for Windows 10. Download it onto an 8-GB drive after running Microsoft's Media Creation tool (microsoft.com) for version 1909. It's not very buggy. I've already installed it on about ten machines with no trouble.
How would I get a Windows 7 product key?
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