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1 Can’t install Insider build 18875? You are not alone – Win10.Guru
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Can’t install Insider build 18875? You are not alone

As we explained in an earlier article, the release of Windows 10 version 1903 (19H1) to the Release Preview ring last week brought some changes to the Windows Insider program. The Fast Ring now gives pre-release builds for a build still a year away, for version 20H1. However, for thousands of users who installed the 19H1 Release Preview and are now switching to the Fast Ring, this upgrade to the latest build is broken and thus, they are unable to upgrade to build 18875.

In the Feedback hub at this moment, one can find over 10,000 entries in various collections about this issue. Not surprisingly, the Insider team having picked one collection to follow and update when new information becomes available.

From the Windows Insider Blog:

UPDATE APRIL 16: A huge thank you to all the Windows Insiders who reported and up-voted feedback on receiving 0xca00a000 and/or 0x80242016 errors when attempting to download and install Build 18875. Your feedback has been immensely helpful in the investigation of the issue.

We have determined that there is an issue with the Build 18362.53 (KB4495666) Cumulative Update that was released early last week which has caused updates to Build 18875 to fail. The issue only impacts 19H1 to 20H1 updates and occurs due to a migration failure as the OS attempts to update to the new build. To resolve this issue, we are creating a new Cumulative Update that will need to be applied on top of Build 18362.53 first before Insiders will be able to update to the latest 20H1 builds.

As we work on this new Cumulative Update, we have stopped offering Build 18875 to Insiders on Build 18362.53 and holding off flighting a new 20H1 build until we can deliver the fix to unblock Insiders. Our goal is for this to happen by the end of this week. We’ll share additional updates as available.

Notice that “The issue only impacts 19H1 to 20H1 updates” as mentioned in the preceding quote is in fact not 100% correct. Some users who had previously installed or upgraded to 20H1 pre-release build 18865 have also had this issue, so it remains to be seen if the Cumulative Update KB4495666 is the only culprit.

At the moment, the build 18875 upgrade is blocked for those users currently in Release Preview, but the Insider team is planning to release a fix for the problem that’s causing CU KB4495666 by the end of this week. As it will be a long Easter weekend, affected users might get 18875 this weekend, but it is also possible that they will have to wait until next week. Stay tuned!


Author: Kari Finn

A former Windows Insider MVP, Kari started in computing in the mid 80’s writing code for VAX / VMS systems. Since then, he’s worked in a variety of IT positions. He specializes in Windows image capture, customization, repair and deployment as well as Hyper-V virtualization. Kari is a proud Team Member at number #1 Windows site

2 Responses “Can’t install Insider build 18875? You are not alone”

  1. CountMike
    April 17, 2019 at 14:22

    Would be nice to know just what was wrong with that build, mine installed without a hitch.

    • April 17, 2019 at 14:31

      Out of my three Insider devices, two got 18875 without issues. Third one failed a few times, not 18875 is no longer even offered because of the block.

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