1 Open an elevated command prompt. 2 Copy and paste the slmgr /upk command into the elevated command prompt, and press [key]Enter [/kry] to uninstall the product key. (see screenshot below) 3 Click/tap on OK when the product key has successfully been uninstalled. (see screenshot below) 4 Copy and paste the slmgr /cpky command into the elevated ... More @Wikipedia
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