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Windows 11 24H2 Windows 11 24H2 Out-of-band update
Out-of-band

KB5039304

KB5039304: Cumulative update for Windows 11, version 24H2, June 2024. Roblox Store downloads fail on Arm; DWM and IME issues fixed

In short

Fixes several Windows issues, including problems with WDAC, DWM.exe, and the IME candidate list. Players on Arm devices cannot download or play Roblox through the Microsoft Store; they can get it directly from Roblox.com.

Does it affect you? Applies to: This update is for Windows 11, version 24H2, which is targeting Copilot+ PCs and devices that previously used Windows Insider 24H2 builds.

Build
26100.1000
Restart
Required
Review notes Additional details from the official release notes (1) Read note
  • What changes On systems using UWF, WMI API calls to shut down or restart can return an access-denied exception.

The official sources are linked at the end of the page.

What changes

Fixes 5 changes

Windows Defender Application Control (WDAC)

2 items
  • Some apps’ policies can be verified again.1
    Addresses an issue where WDAC fails to verify the policies of some apps.
  • A class of policies is no longer reported as inactive or unauthorized.2
    Addresses an issue where WDAC reports a certain class of its policies as not active or authorized.

DWM.exe

  • An issue that might cause DWM.exe to stop responding is addressed.3

Unified Write Filter (UWF)

  • System shutdown and restart requests no longer return an access denied error in the affected situation.4
    Addresses an issue where Windows Management Instrumentation (WMI) API calls to shut down or restart a system throw an access denied exception.

Input Method Editor (IME)

  • The candidate list displays instead of being missing or appearing in the wrong position.5

Improvements 2 changes

Country and Operator Settings Asset (COSA)

For: Devices using certain mobile operators

  • Mobile operator profiles are brought up to date for certain operators.6
    Updates Country and Operator Settings Asset (COSA) profiles for certain mobile operators.

Servicing stack

  • The component that installs Windows updates receives quality improvements.7
    Includes servicing stack update KB5039333, version 26100.998.

Known issues

  1. Open Affects: Everyone

    We’re aware of an issue where players on Arm devices are unable to download and play Roblox via the Microsoft Store on Windows.

    Players on Arm devices are unable to download and play Roblox via the Microsoft Store on Windows.8

    How to apply the workaround Workaround

    Download Roblox directly from Roblox.com.8

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2024-06-28
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5039239
Replaced by
KB5040435
VersionBuildChannel
24H2 26100.1000 General availability

Security

No vulnerabilities are listed for this update.

Sources

Updated
Cited passages from Microsoft's official notes (8)
  1. 1. This update addresses an issue that affects Windows Defender Application Control (WDAC). It fails to verify the policies of some apps. support.microsoft.com
  2. 2. This update addresses an issue that affects WDAC. It reports a certain class of its policies as not active or authorized. support.microsoft.com
  3. 3. This update addresses an issue that might cause DWM.exe to stop responding. support.microsoft.com
  4. 4. This update addresses an issue that affects Unified Write Filter (UWF). Windows Management Instrumentation (WMI) API calls to shut down or restart a system throws an access denied exception. support.microsoft.com
  5. 5. The Input Method Editor (IME) candidate list fails to show or shows in the wrong position. This update addresses this issue. support.microsoft.com
  6. 6. This update brings Country and Operator Settings Asset (COSA) profiles up to date for certain mobile operators. support.microsoft.com
  7. 7. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. support.microsoft.com
  8. 8. We’re aware of an issue where players on Arm devices are unable to download and play Roblox via the Microsoft Store on Windows. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 8 quoted passages · compared with Microsoft's page on Oct 20, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 4/5, clarity 4/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake