I got a message upon attempting install that PSE sensed an impending
computer shutdown and I needed to stop the install, shut down the computer
and try again. There were two choices: ignore & quit. I quit, shut down
and restarted. The subsequent attempt after would not proceed due to "an
installer is already running" message and I was instructed to stop the
installer and retry. After complying, I got the impending shutdown again.
I chose "ignore", and the installation proceeded normally. Clearly a bug
in PSE 13. Thought you'd enjoy.