Unable to update Plesk Fatal error during installation. (Error code 1603) or CustomAction returned actual error code 1612

Symptoms

1. Plesk Update fails with the error:

The package name can be different, but is under the same path

Upgrading Plesk repair module...
Failed to install 'C:\ProgramData\Plesk\Installer\cache\pool\release\PLESK-WIN_18.0.67_16206\dist-windows\plesk-repair-module.msi': Fatal error during installation. (Error code 1603)
Sub-action 'InstallMsiPackage' failed with error code: 1603(0x00000643)
Launching component and product checkers...
Downloading file pool/release/PLESK-WIN_18.0.67_16206/reportupdate.exe: 0%
Downloading file pool/release/PLESK-WIN_18.0.67_16206/reportupdate.exe: 100% was finished.
ERROR: The installation of the package 'plesk-repair-module' failed with code 1603. (upgrade: Upgrading Plesk repair module...)
Not all packages were installed.
Visit https://support.plesk.com/ to search for a solution.
exit status 1

2. Server was rebooted recently there are no pending windows updates

3. The following error is reported in Plesk installer log (C:\ProgramData\Plesk\Installer\autoinstaller3.log)

[2025-01-26 04:02:51.056091] MSI (09): Application: {046AAA09-1702-4511-B51A-4C7BBE67B2A4}, Command line: UPGRADINGPRODUCTCODE={FE2AA3AB-3F4A-42AC-97F9-DC6B13998ABF} CLIENTPROCESSID=29576 CLIENTUILEVEL=3 MSICLIENTUSESEXTERNALUI=1 REMOVE=ALL
[2025-01-26 04:02:51.087342] MSI (04): CustomAction returned actual error code 1612 (note this may not be 100% accurate if translation happened inside sandbox)
[2025-01-26 04:02:51.087342] MSI: Error! The older version of Plesk ModSecurity rules cannot be removed. Contact your technical support group.
MSI (01): The older version of Plesk repair module cannot be removed. Contact your technical support group.

Cause

Windows OS required the access to the original MSI package to complete an uninstallation, some clients remove old Plesk update packages to save space causing the error above.

Resolution

Usually there will be a different package reported after each loop, you can speed up the process by downloading all package of the same version at once.

1. Connect to the server via RDP

2. copy the GUI of the MSI package reported on the Plesk install log eg. {046AAA09-1702-4511-B51A-4C7BBE67B2A4}

3. Navigate to the registry path HKLM\SOFTWARE\WOW6432node\Microsoft\Windows\CurrentVersion\Uninstall{MSI_GUID}

4. Open the Item InstallSource and copy its path.
   

5. Navigate to the folder using the file explorer, check if the folder is empty.

6. Open the web address https://autoinstall-win.plesk.com/ and navigate to the repository of the affected version e.g.: PLESK-WIN_18.0.42_8472\dist-windows\ and download the missing package

7. Move the MSI installer to the path on Step 4.

8. Re-Attempt the update, make sure to close the C:\ProgramData\Plesk\Installer\autoinstaller3.log file so the installer can write if there is another conflicting package.