The same Windows key can be used to activate Windows 10 after upgrading your Windows installation.
In this article, we will discuss the different methods for finding your Windows 10 product key.
This article answers some of the most important questions regarding the use of the Windows 10 product key.

Our theory is that the 2 command-line methods givegenericproduct keys, whichcannotbe used to reinstall Windows 10.
Using Windows Registry
Windows stores the product key in the Registry, which it uses when required.
The premium version of Keyfinder can be used to extract the details including product keys, licenses etc.

of more than a thousand popular programs.
We will use the free version of Keyfinder to find the Windows 10 product key after the upgrade.
You may also useProduKey utilityto find your Windows 10 product key.

Windows will automatically activate your license after the installation of Windows 10 on the same hardware.
However, due to privacy, these were then later stored inside BIOS/UEFI.
You cant move your Windows 10 license to another PC.

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source: www.itechtics.com