Could you please share step by step info about How to use AutoInstaller in this situation. I don't want to broke the panel app. and I don't want to uninstall & install the software..
I have the same problem and the below solution did not worked.
I have changed the version to 7.5 and entered the plesk, when I want to Install Plesk 12.0.8 , It says the same error;
Unable to obtain the latest version of Parallels Installer: The required version '3.16.3' was not found on...