Help with MSI (Microsoft Installer) error 1642: The installer cannot install the upgrade patch because the program being upgraded may be missing or the upgrade patch updates a different version of the program. Verify that the program to be upgraded exists on your computer and that you have the correct upgrade patch.
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This error code is not available on Windows Installer version 1.0.
Answered 01/28/2004 by: AppDeploy.com
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