Installing Photoshop Elements 11 (licensed version) on my Windows 11 PC, I have encountered this problem as well, but I'm not sure that the installation is complete to the point where
I won't be able to reboot. I stopped at the error messages "This app can't run on this device" " PX Engine unknown". and a suggestion that I might try turning off Memory Integrity. Is there any chance that the installation has stopped and I could eliminate the problem by making some changes before I shut down and reboot? Reinstallation of my system would be a major problem for me.
Thanks in advance for your help.