65571: Acronis Cyber Protect Cloud: Installation fails with 'MainEngineThread is returning 1601 MSI'

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Operating Systems: 

Last update: 30-04-2021


Installation in Windows fails immediately upon start.

In installation logs, you find error 1601:

MainEngineThread is returning 1601 MSI


Error code 1601 indicates an issue with the Windows Installer service:

The Windows Installer service could not be accessed.

You can verify that you are facing this exact issue by trying to install another software using its MSI installer.


Check the state of the Windows Installer service and start it if it is stopped.

Re-register the Windows Installer service.

See these articles for details: