"Downgrade not supported error" when trying to upgrade to 5.9.4.1 (4326172)

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"Downgrade not supported error" when trying to upgrade to 5.9.4.1
Description

Upgrade from 5.9.4 to 5.9.4.1 upgrade fails for the .NET agent with "Downgrade not supported error" seen in failure logs.
Cause

-          The problem is caused by older versions of “windows Installer” that does a string comparison incorrectly.

-          Windows installer versions 3.x or 4.x that come with Windows OS 2003 (all flavors) and Windows 2008 (standard/SP1/SP2) incorrectly determines that “5.9.4.1-20140303-1511” is not greater than “5.9.4-20131205-2230” L hence the downgrade error

-          Windows Installer version 5.x that comes in Windows 2008 R2 or later correctly does this check. So we won’t see this error in such environments.

This problem has been noted and progress tracked in DN-1257
Resolution

- - For 5.9.4.1version, go To .NET Administration| Installations tab and select the host in question and select "Uninstall".

Once" Uninstall" finishes, do a fglam restart on host and then select "setup agent .NET " again from the ApplicationServers-Administration Dashboard
Defect ID

DN-1257
Additional Information

The 5.9.5 build will not (would not have) run into this problem. There will be no issues upgrading to 5.9.5 from 5.9.4.1 or any older versions.

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