Parallels Plesk Panel version information can be found in the Plesk Control Panel on the Component Management page.You can log into the server and read the version information located in the file “version.”
Parallels Plesk Panel for Linux
Version information can be found in the file “$PRODUCT_ROOT_D/version.”
# cat /usr/local/psa/version
10.4.4 CentOS 5 1013120126.11
Output shows the Parallels Plesk Panel version, operating system, and build number. In this example, the version is 10.4.4. The operating system is CentOS 5, and the build number is 1013120126.11.
Use the system package manager to find your Plesk version. For example, on RPM-based systems:
#rpm -q psa
In Parallels Plesk Panel 10.x, the version and build information can be found on the System Statistics page (Home -> Tools & Utilities -> Server information).