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Updating Veeam Installer Service fails with "Another version of this product is already installed"

KB ID: 4282
Product: Veeam Backup & Replication | 11 | 12
Veeam Agent for Microsoft Windows | 5.0 | 6.0
Published: 2022-02-21
Last Modified: 2023-02-20
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Challenge

When updating the Veeam Agent for Microsoft Windows deployment on a machine that is part of a 'Computers with pre-installed agents' Protection Group, attempting to run VeeamInstallerSvc.msi causes the error message: 
Another version of this product is already
installed. Installation of this version cannot
continue. To configure or remove the
existing version of this product, use
Add/Remove Programs on the Control
Panel.
Installer Error

Cause

This error occurs because the existing version of the Veeam Installer Service must be uninstalled before installing a new version.

Solution

Review the Update Procedure for Windows Computers section of the Veeam Agent Managed User Guide for more information on updating Windows computers associated with a 'Computers with pre-installed agents' Protection Group.
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