Another guy has the exact same issue on reddit. https://old.reddit.com/r/radeon/comments/1h7cf7v/amd_software_adrenalin_edition_24121_release_notes/...
After the computer comes back you cant run the installer, it unpacks the drivers and then the installation utility doesnt start at all. Theres also no Radeon Settings anymore.
I used DDU to go back to 24.10.1 which works fine.
My system is as as follows Windows 11 23h2, 12400f, rx 7600.
Suffice to say i think i will refrain from updating again through the radeon settings which worked fine for me until now.
UPDATE: After i DDU and went back to 24.10.1, i thought maybe the problem was caused from updating through Radeon Settings. Instead i tried installing the new drivers using the installation medium from the website. Glad to report the drivers installed fine with this method. Hopefully there are no other problems.
If anybody else runs into this, after you DDU or use the cleanup utility instead of reverting to an older version try installing again the latest using the installation medium, it should work.