• 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.

Can´t install Plesk 12

Make sure that you have the same size and permissions for this file:

# ls -la plesk-installer
-rwxr-xr-x 1 root root 5604 May 29 16:19 plesk-installer

Also try to run installer in verbose mode with

# sh --verbose plesk-installer
 
Dear IgorG,

Thanks for the reply.

root@xxx:/var/tmp# ls -l
total 60540
-rwxr-xr-x 1 root root 5604 jun 11 08:56 plesk-installer

root@xxx:/var/tmp# sh --verbose plesk-installer
sh: 0: Illegal option --

I download again the file, same problem...
 
It seems to me there is something wrong with your OS.
What about

# sh plesk-installer
 
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