You can follow along here.
https://support.microsoft.com/en-us/windows/activate-windows-c39005d4-95ee-b91e-b399-2820fda32227
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and Accept as answer
if the reply is helpful--
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I upgraded from windows 10 to windows 11 in November 2021. Now because of technical reasons, I want to go back to windows 10. How do I activate digitally Windows 10 after clean installation that I had before upgrading to Windows 11?
You can follow along here.
https://support.microsoft.com/en-us/windows/activate-windows-c39005d4-95ee-b91e-b399-2820fda32227
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
Anytime you need to reinstall Windows 10 on that machine, just proceed to reinstall Windows 10. It will automatically reactivate. You will prompted to enter a product key a couple times through the installation, click I don't have a key and Do this later.
There are end users that had downgraded Windows 11 to Windows 10 after the 10 day default rollback period.
A clean install was not required.
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You can use same Windows 10 product key that you earlier used to activate it. If it is an OEM license, it may be automatically activated after clean install.
Hi there,
If it is an OEM key and digitally linked then you can just clean install and then it will be reactivated without any action from you. If it is retail and you have the key, just select the change product key and input your Key.
Here is a link for a detailed description of the process that you must follow.
Reactivating Windows after a hardware change
https://support.microsoft.com/en-us/windows/reactivating-windows-after-a-hardware-change-2c0e962a-f04c-145b-6ead-fb3fc72b6665
--If the reply is helpful, please Upvote and Accept it as an answer--