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There is no new activation system for Windows 11, all the keys are the same as Windows 10.
Win 11 Pro to Win 10 Pro
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rkr
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How to run Win 10 Pro after buying Win 11 Pro license.
That is, I understand one can use a Windows 11 Pro key to install and activate the Windows 10 Pro installation, knowing that the key and the activation are not licenses but instead just enable the product.
The license is the COA sticker and as long as the unit has a Windows 11 Pro COA sticker, one has the rights to install Windows 10 Pro.
Windows for business | Windows Client for IT Pros | Devices and deployment | Set up, install, or upgrade
Windows for business | Windows Client for IT Pros | User experience | Other
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Kapil Arya 8,541 Reputation points Volunteer Moderator2023-09-02T09:44:18.1266667+00:00 AFAIK, you can not use Windows 11 key to activate Windows 10. However, Windows 10 key can be used to activate Windows 11.