You could simply copy the existing OS partition to a blank partition, add it to the boot menu, then upgrade that to Windows 11.

More than one computer. I'll bet the computer that won't install the second Windows needs INTEL RST ( Rapid Storage Trchnology) drivers.

You can also use DISM while booted into Windows 10 to apply an imagine contained in /sources/install.wim or /sourcs/install.esd from the Windows 11 mounted ISO file or USB flash drive to the...