Activate Windows - Microsoft Support
https://support.microsoft.com/en-us/windows/activate-windows-c39005d4-95ee-b91e-b399-2820fda32227
WebDepending on how you got your copy of Windows 10, you'll need either a digital license or a 25-character product key to activate it. Without one of these, you won't be able to activate your device. A digital license (called a digital entitlement in Windows 10, Version 1511) is a method of activation in Windows 10 that doesn't require you to ...
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