Plesk update failed with the following error:
CONFIG_TEXT: Execution failed.
 = --select-product-id
 = plesk
 = --select-release-current
 = --upgrade-installed-components
Details Doing restart of Plesk installer
BUSY Update operation was locked by another update process
Plesk installer is accessible from the command line.
There are no stuck autoinstaller processes which should be killed, as described in the article Launching Plesk autoinstaller fails: Update operation was locked by another update process.
Connect to the Plesk server via SSH/RDP.
Reinstall Plesk micro-updates:
# plesk installer --select-release-current --reinstall-patch --upgrade-installed-components