• 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

It's safe update to CentOS 5.9?

It is more related to fresh installation.
You can upgrade OS on system where Plesk already installed only on your own risk.
 
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