Can you downgrade a Windows 11 system to Windows 10? (and will it activate?)

Test if you can downgrade a new system with Windows 11 preinstalled to Windows 10 and whether or not the Windows 10 installation will activate.

Tested both by running Windows 10 installer from Windows 11 and through a clean install.
Download Windows 10 using the Create Windows 10 installation media tool at https://www.microsoft.com/en-gb/software-download/windows10 and a

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