Most computers using Windows 10 can upgrade to Windows 11.
This may be able to be performed in a supported or an unsupported fashion.
Unsupported upgrades may not benefit from the improvements in performance, reliability, and security.
Microsoft reported that unsupported upgrades may not receive regular Windows and Microsoft defender updates.
There are many computer users that installed Windows 11 in a supported and and unsupported fashion.
There are many happy users of Windows 11.
There are many unhappy users of Windows 11 that could not easily return to Windows 10.
When considering major upgrades it is always best to have backup images.
These are some third party software to make free and pay versions of backup software:
(Acronis, Aoemi, EaseUS, Macrium, Paragon, etc.)
There is a default 10 day go back period.
There are methods to modify the default go back period to 60 days.
These are some links on Windows 11 upgrades:
Microsoft Windows PC checker for Windows 11: https://aka.ms/GetPCHealthCheckApp
https://blogs.windows.com/windows-insider/2021/08/27/update-on-windows-11-minimum-system-requirements-and-the-pc-health-check-app/
https://support.microsoft.com/en-us/windows/installing-windows-11-on-devices-that-don-t-meet-minimum-system-requirements-0b2dc4a2-5933-4ad4-9c09-ef0a331518f1
https://www.elevenforum.com/t/lets-install-windows-11-on-incompatible-hardware.133/
https://www.elevenforum.com/t/bypass-windows-11-tpm-2-0-and-cpu-system-requirements.1989/
https://support.microsoft.com/en-us/windows/ways-to-install-windows-11-e0edbbfb-cfc5-4011-868b-2ce77ac7c70e