Windows 10: Downgrade Windows 11 PRO to Windows 11 Home Edition without data loss

I changed my product key to windows 11 pro by this site: https://www.blowingideas.com/windows-11-product-keys/. But now is telling me this:So, I tried to restart the laptop, but nothing happened. I also tried windows update, but there was an error: Is there any way to change to Home edition for free?

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how to downgrade windows 11 pro to windows 11 home single language?

I have installed windows 11 pro (i.e. not genuine) which is not activating as I have digital licence for windows 11 home single language edition and troubleshooter says that i will have to go back to home single language edition to activate windows. so, how can I downgrade windows 11 pro to my previous genuine windows 11 home single language edition?

 

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.

 

Windows 11 Pro Upgrade from Windows 10 Pro Edition

No but after it installed the malfunctioning Windows 11 upgrade it was listed as Windows 11 Pro. Microsoft Windows support advised I reinstall Windows 10 Pro and said that Windows 11 is really only meant for new PC's that come with it preinstalled. MSI website doesn't list my 2020 GT76 Titan dt-039 notebook on their Windows 11 upgrade eligibility list so I guess that's why the Windows 11 Pro upgrade failed. I suggest being careful with trying the Windows 11 upgrade despite it stating my notebook was capable of running Windows 11 it was wrong. Luckily I have the original Windows 10 Pro USB Flash drive because the Windows 11 Pro upgrade was so incomplete I had no way of reverting notebook back to Windows 10 without reinstalling from a USB Flash.