Get help with Windows activation errors - Microsoft Support
https://support.microsoft.com/en-us/windows/get-help-with-windows-activation-errors-09d8fb64-6768-4815-0c30-159fa7d89d85
WEBHere's how to activate Windows: Select Start > Settings > System > Activation . If you have a valid product key, select Change product key, and then enter the 25-character product key. If you don’t have a valid product key, select Go to Microsoft Store, and follow the instructions to buy a digital license for Windows.
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