• Debian 11 is approaching its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.80 will be 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.

installing plesk

1603 is common msi error. Look at event in the EventViewer from MSI Installer. There is usually close to the event from 1603 is an most detailed error description.
You also need to look at autoinstaller log in the place where is written about 1603 or slightly above.
Contact Support Team if you can't find more detailed description of error in logs. They will check and fix it directly on your server.
 
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