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Debian 11 has reached its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.81 is the last release to support it.
If you are running Plesk Obsidian on Debian 11, we recommend you upgrade those servers to Debian 12 using our dist-upgrade tool.
We plan to deprecate and remove the support for XML RPC protocol versions earlier than 1.6.9.1 in Plesk Obsidian 18.0.82. We strongly recommend that you update all existing integrations using earlier versions of the XML RPC protocol to comply with the version 1.6.9.1 specification.
The best and simplest way I can suggest would be to (assuming you read the instructions properly beforehand and did exactly as it and the website suggest... run a full backup before upgrading):
Uninstall Plesk 7.5
Reinstall 7.1.6 from the RPMs
Restore Plesk backup from the backups you ran prior to the upgrade
psarestore is very slow at restoring server dumps so I would only recommend you do that if you *absolutely* cannot live with Plesk 7.5.0 - if you're having problems with it then (imho) the best solution would be to either report the bugs to SWsoft and await a fix or look for external help.