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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
The problem is, that in this list of composer.jsons the central one in the roundcube-root is missing in the plesk version. You can not install anything without that. And copying the original one from the official roundcube files does not work, as Parallels made some changes. That's was Jorge...