How to update Plesk extensions like Plesk Migrator, Let's Encrypt and etc on Plesk Onyx?
All extensions updates, if any, available in Extensions > Updates section.
By default, auto-update option is turned on and the extension will be updated during the daily maintenance task.
However, if an update is possible, you can put a tick on extension and click Update button.
Plesk Onyx 17.8