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Title
Upgrade fail, see Installation failed with error:1638. Another version of this product is installed -
Description
Upgrade failed and now see Installation failed with error: 1638. 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.
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Cause
In Add/Remove programs in the control panel you will only see an option to change. Windows installer hung and the install is corrupt.
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Resolution
Download and install Windows Installer CleanUp Utility 2.5.0.1.
http://www.softpedia.com/progDownload/Windows-Installer-CleanUp-Utility-Download-18442.html
Once installed select the AppAssure Agent install and click remove. Go to Program Files and delete the AppRecovery folder
Run the Agent installer again.