Question

what is the product key of window 10 and window 7

Please give me the answer right now ?​

Answer 1

As part of Windows 10's first November update in 2015, Microsoft changed the Windows 10 installer disc to also accept Windows 7 or 8.1 keys. This allowed users to perform a clean install Windows 10 and enter a valid Windows 7, 8, or 8.1 key during installation.

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