Pardon my ignorance. how would you apply the reg file to the boot.wim I am experiencing the same issue with a 24H2 iso I have from my workWinPE Setup for 24H2 defaults to a new Setup client.
Some users claim to have install problems with it, while others think it's too ugly. If you prefer seeing the "Classic" client, you can apply this reg file to boot.wim (Setup):
Code:Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SYSTEM\Setup] "CmdLine"="X:\\sources\\setup.exe"

