hummmm . . . it would appear that the registry change only works when upgrading from Win 10 to Win 11, rather then Win 11 to Win11. In addition, booting from an external image also does not have the desired effect (error message: upgrade option isn’t available . . . using installation media).
With a bit of research I did find this on elevenforum.com [excerpt below] which I have tested, and it worked, so you might like to give it a go.
Overview
- Disconnect from the internet before attempting to upgrade an unsupported device to 22H2.
- Replace appraiserres.dll with a dummy file of zero length.
- During Win 11 setup checks, select updates as 'not right now'.
Procedure
i. Disconnect the workstation/VM from the internet
ii. Replace the appraiserres.dll with a dummy file of zero length. Make a 'New Text Document' on your desktop, rename it appraiserres.dll, and put that in place of the original one.
Note: you cannot change this file if using an ‘expanded’ iso, or any protected media, if this is the case then just copy the content to another location on the workstation/VM to be upgraded, and modify and run from there.
iii. Run the Win 11 22H2 setup.exe
iv. From the setup menu select 'Change how Setup downloads updates'
and on the next window select 'Not right now'
v. Then, continue to install as per normal . . .
As this relates to Microsoft then would suggest that if you have any further queries then would suggest heading over to the good folks at elevenforum.com for further assistance.
Notes and Observations
As an exercise I ran through the upgrade with only changing the appraiserres.dll file with a dummy file of zero length . . . and ignored the 'disconnect from the Internet' and the 'Change how Setup downloads updates', and all worked without these two steps. It may be down to the particular setup/configuration of the Win 11 which is being upgrade, so select the option which best suits your environment.