Although has a higher system requirement, you may still be able to perform an in-place upgrade on an unsupported computer by editing the Registry of the current setup and using the official installation media.
You can get it from this site and then start the installation of Windows 11.
Then you can go back to Windows 11 setup page.
To do this, when your manufacturer logo comes on the screen, press F12 or F2 this varies by manufacturer to jump into the boot menu.
Go back to the official download page, click the download now in Create Windows 11 installation media.
Rufus is a free tool with many options to help you create a bootable media of Windows 11, 10, or 8.