Windows 10: Windows can't find my activation code when i downgraded from Windows 11 Pro to 10 Pro....

Basically, i didn't make this PC, it was a pre-build and the operating system was already in it Windows 11 and wasn't logged in as a Microsoft account but rather as a local account. I later on just signed up on Microsoft. Recently, i downgraded Windows 11 to 10, and i saw that it couldn't activate the product key that was on the Windows 11. Since I've already done that before with a laptop, i tough it was gonna save it. Every options, or buttons i tried to fix this issue in the activation section doesn't show anything or couldn't help, so i again, upgraded to Windows 11 to see if the issue w

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Windows 10 pro

I need to change my motherboard, have windows 10 pro. When i google how to it says go to activation then add an account, my issue is there is no add an account option under activation? Or am I in the wrong window?



Not sure how to proceed, ive googled it and the same results. Do I have an OEM or? On the disk sleave it says OEI DVD?
The COA says windows 10 pro for OEM software

 

Windows 11 Home to Pro upgrade

Want to upgrade 11 Home to 11 Pro. Tried download, but apparently files transferred were for 11 Enterprise. This will not activate; error is "invalid digital license or product key". This is on a new Surface. How to proceed?

Can withdraw/delete this. The suggestion to downgrade - listed below - with a 'fake' windows 10 key works.

 

Downgrade Windows 10 enterprise to Pro

Hi Sumit,

Thanks for your quick response and help, But I was told that if I inserted the Windows 10 Pro product key into the activation section it will be downgraded automatically like the following steps:

1. Open the Settings app and click Update & Security.
2. Open Activation and click Change product key.
3. Enter your Windows 10 Professional product key and click Next.
4. Restart the computer after the new product key is activated.

Can this be helpful ?