Windows 10 doesn’t require a product key to install and use
https://www.digitalcitizen.life/windows-10-doesnt-require-product-key/
WEBMar 21, 2022 · If you install Windows 10 without a product key and Microsoft doesn’t activate it, you will be able to use it indefinitely, but with a couple of limitations. The most important ones are as follows: Windows 10 will show an “Activate Windows” watermark in the bottom-right corner of the screen.
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