How to install Plesk updates?
Note: For upgrading Plesk to the next release, see this KB article.
By default, Plesk installs updates automatically by means of the Plesk daily task (executed every night), if the option Automatically install Plesk updates is enabled at Tools & Settings > Update Settings.
During the update process:
Plesk may go offline for several minutes, if updates require a Plesk restart
Websites will stay online
Note: If a service component is going to be updated, its service will be restarted.
To find out what Plesk update is currently installed on the system, go to the Home page > System Overview.
Alternatively, execute the following command in a command-line interface:
MYSQL_LIN: plesk version