MspInstallAction failed when installing an Update Rollup on Microsoft Dynamics CRM

SYMPTOMS
When trying to install Microsoft Dynamics CRM 2011 Update Rollup 6 or higher you get the following error:

Action Microsoft.Crm.UpdateWrapper.MspInstallAction failed. The upgrade cannot be installed by the Windows Installer service because the program to be upgraded may be missing, or the upgrade may update a different version of the program. Verify that the program to be upgrade exists on your computer and that you have the correct upgrade

CAUSE
The full install packages (slipstreams) for version 5.0.9689.1985, were re-released. This was the install packages that included Update Rollup 6. Due to this re-release the old install packages are no longer valid for future Update Rollups.
RESOLUTION
To resolve this issue you will need to uninstall the current Dynamics CRM Server, Client, E-mail Router or any other component you may have installed using those slipstream packages. Then you will need to reinstall with the new packages that are available on the Microsoft Download Site.

MORE INFORMATION
If you initially installed the Update Rollup 6 patch (http://support.microsoft.com/kb/2600640), you will not see this issue installing future update rollups. 

If you are on Update Rollup 5 or an earlier version of Dynamics CRM 2011 you will not see this issue updating to the re-released Update Rollup 6 patch.

Update Rollup 6, install, MSPInstallAction,
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.
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Article ID: 2668504 - Last Review: 01/23/2012 20:14:00 - Revision: 3.0

Microsoft Dynamics CRM 2011, Microsoft Dynamics CRM Online Professional Edition

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