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Editorial Team
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Asked: 2026-05-25T21:29:21+00:00

I installed my product named XYZ.msi. Then, I created a patch (patch1.msp) and applied

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I installed my product named XYZ.msi. Then, I created a patch (patch1.msp) and applied that patch on my product and it worked fine. I can also see the changes in the Add/Remove Programs.

Then I created another patch (patch2.msp) for the same product (XYZ.msi) and when I double clicked it, it says “The program to be upgraded may be missing”. I don’t understand this when I apply patch2.msp on XYZ.msi without applying patch1.msi first it works fine but applying both patches doesn’t work.

I am making patches through Windows Installer SDK through msimsp.exe by patch.pcp file.

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1 Answer

  1. Editorial Team

    This happens because your patches are not authored correctly. A patch shouldn’t change the ProductCode or UpgradeCode. It also shouldn’t remove components or features from the original installer.

    You can read more about the patch authoring rules here:
    http://msdn.microsoft.com/en-us/library/aa367850(VS.85).aspx?ppud=4

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