Download Windows 11 from Microsoft web site
Create bootable USB key
Option 1: (no guarantee it will work in the future (18/12/2021))
Boot from USB key
During the first screen hold Shift+F10 and type regedit in the opened command window
Add additional key in the register:
Computer>HKEY_LOCAL_MACHINE>SYSTEM>Setup>LabConfig
Add two DWORDS (32 bit) in the newly created key "LabConfig"
BypassTMPCheck (value 1)
BypassSecurityCheck (value 1)
Option 2: Copy install.esd file from the Windows 10 "source" folder into Windows 11 "source" folder.