Error when install CU23+ Windows Installer

Magic Alerts 21 Reputation points

Hi, I tried to install the CU23+ for Exchange 2013 and I had this error:
The Update patch cannot be installed by the windows installer service because the program to be upgraded may be missing ...
Can someone help on how we can sort this issue.


Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Yuki Sun-MSFT 41,011 Reputation points

    Hi @Magic Alerts ,

    By "CU23+ for Exchange 2013", do you mean the Cumulative Update 23 for Exchange Server 2013 (KB4489622) or you are referring to the recent released security update Security Update For Exchange Server 2013 CU23 (KB5000871)?

    If you are installing KB5000871, please be aware that this update requires Exchange CU23, so you would need to upgrade server CU first, then you can check the following article and follow the best practices there to apply the patch:
    FAQ for March 2021 Exchange Server Security Updates

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