Windows 10 V1903: Updates KB4512941 and KB4515530

[German]Microsoft released a cumulative update KB4512941 and a Servicing Stack Update (SSU) KB4515530 for Windows 10 Version 1903 on August 21, 2019. This should finally fix the sandbox problem. However, the updates don't seem to be distributed 'officially' yet. It's tested in Release Preview ring.


A list of the updates can be found on this Microsoft website (currently not documented). The update installation requires an existing current Servicing Stack Updates (SSUs). Microsoft now publishes an overview of current Servicing Stack Updates (SSUs) under ADV990001. The Windows 10 versions up to version 1709 are no longer supported in Home and Pro – only the Enterprise versions receive the updates there.

Update KB4512941 for Windows 10 Version 1903

Cumulative Update KB4512941 (dated August 21, 2019) raises the OS build to 18362.325 and includes quality improvements but no new operating system features.

Currently, Microsoft has not yet updated its documentation and does not provide it in the Microsoft Update Catalog. The update is mentioned here. And the colleagues from German site writes here that the sandbox finally works (in Windows 10 systems with language settings other than English, see Windows 10 V1903: Update KB4497936 breaks Sandbox) after the update installation.

Currently still quite buggy

Due to the lack of documentation from Microsoft, not much can be said yet about the fixes of this update.  According to this comment the sandbox bug has been fixed only partially (some programs developed won't run within the sandbox environment). In the comments of it is also criticized that the search does not work and Cortana runs with 44 % CPU load.

User Ben writes here that a registry entry is the cause. He suggests the following reg file for import.




The entry forces the Bing search, whereupon the CPU load for Cortana decreases and the search also works. However, another user cannot confirm this, Cortana continues to run at high load. By the way, the problem has been there for 2 weeks at Windows 10 19H2 Insider Preview and nothing is happening at Microsoft. Deskmodder has added the information that the problem only occurs if users have changed the search settings. As soon as the search index is rebuilt, the load should go back. The region setting German/Austria should also help with the Cortana load (well, since Strache is gone, you don't have to search in Austria anymore). In the comments here some users mention that Windows wants to 'synchronize' itself when restarting. At the moment this update is more of a toilet exercise – maybe Microsoft is still testing and will release it on August 22, 2019.

Addendum: I've written a brush up with findings reported from my blog readers at Windows 10 V1903: MS investigating the Search/Cortana issue (09/03/2019). There you will find also a confirmation, that Microsoft is investigating the issue and plan a fix in upcoming releases.

Update KB4515530 for Windows 10 Version 1903

It is a Servicing Stack Update (SSU), which is mentioned here (unavailable). Also here there is no information from Microsoft available yet.

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4 Responses to Windows 10 V1903: Updates KB4512941 and KB4515530

  1. Barry McCartney says:

    I have 1903 at build 18362.329 and noticed the high CPU usage at 21%
    After investigating and reading a few posts I discovered that after windows update KB4512941 , the problem had occurred for some people and this was because of " BingSearchEnabled" which was set to 0 in the registry.
    Set it to "1" instead and problem of high CPU usage went away – In my care went from 21% down to 4%

    You'll find it to :
    HKEY_CURRENT_USER, SOFTWARE, Microsoft, Windows, CurrentVersion, Search.

  2. Terry says:

    Setting BingSearchEnabled to 1 resolved this for me as well. Thanks for the info.

  3. Pingback: Microsoft STILL hasn’t acknowledged the bugs in last Friday’s Win10 1903 cumulative update @ AskWoody

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  5. Facebook says:

    Updates KB4512941 and KB4515530 is the latest update of update 1903. This update finally solved the sandbox problem. Install both updates to solve the issues which is arisen.

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