Login to the Plesk control panel with admin user
On the left hand side menu bar, select Tools & Settings under Server management section.
On the next page, click on the Updates and Upgrades menu.
You will be taken to the Plesk Updates page. If updates are available Install or Upgrade Product Icon will be operational. Othewrwise the option will be greyed out.
You can periodically check for updates and follow the steps as mentioned above.
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