Upgrading Plesk Using Administrator GUI

This is the quickest and easiest way to upgrade Plesk. Follow the steps below, and you will be running the latest Plesk version in no time: By default, this method only allows you to upgrade to the latest stable Plesk release (for an explanation about the different Plesk release tiers, click here).

source: https://docs.plesk.com/en-US/onyx/deployment-guide/plesk-installation-and-upgrade-on-single-server/upgrading-plesk-using-administrator-gui.76756/