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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
You really don't want to run the installer first. But if there are missing packages, yes, it will throw out a bunch of warnings and errors, and of course, not install properly.
It's much better to have all required's installed first, to avoid possibility of a bad install from having to run the installer multiple times... (IMO)