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Activation links a Product Key or digital licence to your device. Successful activation alone does not prove that a Windows copy is genuine. Activation also does not extend the Microsoft support period.
In Windows 10 open Start, Settings, Update & Security, Activation. Check the edition installed and the message shown. A license for a different edition should not automatically be considered usable for Windows 10 Pro.
If you have a valid Product Key for the installed edition, select the option to change the product key and follow the Microsoft instructions. With a digital licence, activation depends on the entitlement already associated with the device and the applicable terms. A reinstall does not always require a new key.
A major hardware change can require reactivation. The result depends on the installed edition and the licence terms. Note any error code and use the official activation troubleshooter for your version of Windows.
Standard support for Windows 10 ended on 14 October 2025. Extended security updates require the conditions of the applicable programme to be met. Activating Windows does not enrol the device in that programme. Check the current official requirements and dates, or consider a supported operating system compatible with the device.
Use only the official procedures indicated for your version. Don't rely on unverified activation tools or generic instructions presented as one-size-fits-all.
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