Symptoms

Unable to update Plesk. The following error can be found in Plesk installer:

MSI: Error! The specified account already exists.
Failed to install 'C:\ParallelsInstaller\parallels\PANEL-WIN_17.0.17\dist-msi-Microsoft-2003-i386\plesk-l10n_mu013.msi': Fatal error during installation. (Error code 1603)
ERROR: The installation of the package 'plesk-l10n' failed with code 1603. (upgrade: Upgrading Plesk additional locales...)
Not all packages were installed.
Please contact product technical support.
exit status 1

Also, the following errors can be found in C:\ParallelsInstaller\autoinstaller3.log log file:

[2017-01-24 14:10:41.961552] MSI (04): Property(S): SourcedirProduct = {AA541393-EA1C-4BA1-99D7-41CDE40110BF}
[2017-01-24 14:10:41.961552] MSI (04): === Logging stopped: 1/24/2017 14:10:41 ===
[2017-01-24 14:10:42.086562] Package action: InstallMsiPackage, package: plesk-l10n, exec time: 88 sec. desc: file='C:\ParallelsInstaller\parallels\PANEL-WIN_17.0.17\dist-msi-Microsoft-2003-i386\plesk-l10n_mu013.msi', command-line='REINSTALL=ALL REINSTALLMODE=vmscd ADDLOCAL=ALL ALLUSERS=1 ARPSYSTEMCOMPONENT=1 REBOOT=R AUTOINSTALLER=1'
[2017-01-24 14:10:42.086562] Failed to install 'C:\ParallelsInstaller\parallels\PANEL-WIN_17.0.17\dist-msi-Microsoft-2003-i386\plesk-l10n_mu013.msi': Fatal error during installation. (Error code 1603)
Action '<install-msi-package command-line="REINSTALL=ALL REINSTALLMODE=vmscd ADDLOCAL=ALL ALLUSERS=1 ARPSYSTEMCOMPONENT=1 REBOOT=R AUTOINSTALLER=1" />' failed with error 1603(0x00000643)
Error: The installation of the package 'plesk-l10n' failed with code 1603. (upgrade: Upgrading Plesk additional locales...)
Not all packages were installed.
Please contact product technical support.

Cause

The package was not installed properly.

Resolution

1. Remove corrupted package by using MsiExec.exe and the GUID mentioned in the error message:

   MsiExec.exe /X{AA541393-EA1C-4BA1-99D7-41CDE40110BF} AUTOINSTALLER=1

2. Re-run update.