• 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.

error upgrading 7.5.4 to 7.5.5

It is download error. You can try to download full Plesk distributive ant try upgrade again.
 
If you already have 7.5.x installed, I would strongly suggest you to install update only.

Prior doing any updates to Plesk, stop all services (Plesk icon in sys tray -> Control Panel -> Select all -> Stop).

Last Plesk update took me 1 hour... consider updating it at night while traffic to your server is low.
 
thx matija,
this night I retry to install the patch. Maybe the firewall has blocked access to that internet url.
 
I had an error when downloading the 7.5.4 > 7.5.5 patch. I disabled the proxy settings on IE and Firefox and on the server and that did it for me. Hope that helps.
 
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