Windows 10 V190x: Update KB4522355 & KB4525419 (Insider)

[German]Microsoft has released two updates (KB4522355, SSU KB4525419) for the Windows 10 versions 190x on October 17, 2019. However, these are only delivered to Windows Insider for testing purposes. Here is an overview of these updates.


Preliminary remarks on the updates

The update delivery mechanism for Windows 10 versions 1903 and 1909 is currently a bit complex. Microsoft pushes the same update packages on system with Windows 10 V1903 and Windows 10 V1909, but with different build numbers (version 1903) and (version 1909). Some updates are rolled out to regular users of Windows 10 version 1903, while people in the Windows Insider program also get these updates for Windows 10 version 1909.

Then there are updates that are released for Windows 10 Version 1903 and 1909 as Insider Builds only. You can get them only, if you're a Windows Insider and has opted for the Release Preview Ring. The updates from October 17, 2019 are exactly such a test update for Insiders.

In other words: Regular users who are on the road with version 1903 of Windows 10 Home or Pro, as well as administrators of Windows 10 1903 Enterprise do not need to read any further at this point. Save your time and do something useful. Only for the clientele who run the risk of breaking a finger while boring their noses, I have some distraction.

Update KB4522355 for Windows 10 V190x

Cumulative Update KB4522355 is available only for Windows Insiders, that opted for the Release Preview Ring in Windows 10 Version 1903 or Version 1909.

  • On Windows 10 version 1903 (19H1), update KB4522355 raises the build number from 18362.418 to 18362.446.
  • On Windows 10 version 1909 (19H2), update KB4522355 raises the build number from 18363.418 to 18363.446. 

At Windows Tensforum is this forum thread, where someone posted screenshots of windows resulting from this update. What exactly the update fixes is unknown or not documented by Microsoft. In the linked Tensforum-Thread users report that the update enables an 'Inplace-Upgrade' for the first time while retaining the files and programs.

Other 'testers' mention [e.g. here] an aborted update installation. And there are people who end up with build 18362.10022 or build 18362.10024. Colleagues from German site suppose that the update could have a fix for the start menu issues and may be tested.


Without documentation from Microsoft, however, this is difficult to answer.

SSU KB4525419 for Windows 10 V190x

Update KB4525419 is a Servicing Stack Update (SSU) for the two Windows 10 builds mentioned above. What is fixed is unknown.

The colleagues at offers here the respective updates for direct download. But my recommendation is: Keep your fingers away from that updates – unless you are bored and have to waste some time.

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2 Responses to Windows 10 V190x: Update KB4522355 & KB4525419 (Insider)

  1. EP says:

    KB4522355 recently re-released in RP ring as build 18362.448/18363.448, guenni

  2. Woody Leonhard says:

    Odd. After installing KB4522355 (on the Preview Ring), I now get "Optional updates available / Feature update to Windows 10 version 1909."

    Wonder if that's (part of) the reason for the patch?

    – Woody

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