Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature currently requires accessing the site using the built-in Safari browser.
If you are still using CentOS 7.9, it's time to convert to Alma 8 with the free centos2alma tool by Plesk or Plesk Migrator. Please let us know your experiences or concerns in this thread: CentOS2Alma discussion
Unfortunately not enough useful information here, perhaps this might point also to an issue within the repsoitory which is used on your system for the upgrade. Try to run Plesk installer in debug mode with
# plesk installer --debug
and find more useful information about this issue in /tmp/autoinstaller3.log file.
If this will not help, I think it would be better to forward this issue to Plesk Support Team first for investigation directly on your server. How to get support directly from Plesk?