Failed to update Plesk: The process cannot access the file because it is being used by another process

Symptoms

1. Plesk failed to update with the following error in Plesk Panel:

'PLESK_ERROR: 'Failed to update Plesk. To solve this problem, you can send the update log to Plesk Support.

2. In C:\ParallelsInstaller\autoinstaller3.log file the following error could be found:

CONFIG_TEXT: Error: can't apply patch panel-17.5.3~patch22 The process cannot access the file because it is being used by another process. (Error code 32) at rename file C:\Program Files (x86)\Parallels\Plesk\admin\plib\functions.php to C:\Program Files (x86)\Parallels\Plesk\admin\plib\.aiupd_23873\functions.php.old

Cause

Functions.php was being used by another process at the time of the update.

Resolution

Wait for several minutes and re-initiate the update process again. Alternatively, run the following command in command line to start update procedure:

C:\> plesk installer --select-release-current --reinstall-patch --upgrade-installed-components