Plesk update, upgrade or installation fails with the following error:
Upgrading Plesk base locale...
Failed to install 'C:ParallelsInstallerparallelsPANEL-WIN_17.8.11dist-windowsplesk-locale-base-en-US_mu011.msi': Fatal error during installation. (Error code 1603)
ERROR: The installation of the package 'plesk-locale-base-en-US' failed with code 1603. (upgrade: Upgrading Plesk base locale...)
Not all packages were installed.
Please contact product technical support.
exit status 1
Another installation is in progress or a reboot is required after a previous installation, usually an MSI package.
Connect to a Plesk server via RDP
Reboot the server
Open Task Manager and verify that the
msiexec.exeprocess is not running. In case it is running, finish this process.
Restart Plesk update/upgrade in a command-line interface
If the installation fails with the same error message, follow the steps from the Microsoft KB article.