Microsoft has released a new preview update for Windows 10 22H2, which includes fixes and quality improvements from previous updates (KB5063709 and KB5066188). This update addresses various issues, including problems with supplementary characters in textboxes, the Chinese Simplified Input Method Editor, and network device interface streaming performance. Additionally, it introduces a new feature allowing customers to block outbound network traffic using the Windows 10 keyless Commercial ESU solution and makes Windows Backup for Organizations generally available. A known issue with NDI streaming performance currently affects the update, but it also resolves several other issues.

August 26, 2025—KB5063842 (OS Build 19045.6282) Preview

Applies To:

• Windows 10 Home and Pro, version 22H2
• Windows 10 Enterprise Multi-Session, version 22H2
• Windows 10 Enterprise and Education, version 22H2
• Windows 10 IoT Enterprise, version 22H2

Summary Important: To update to Windows 10, version 22H2, use the EKB KB5015684.

This preview update includes fixes and quality improvements from the following updates:

1. August 12, 2025—KB5063709: Windows 10, version 21H2 and 22H2 (OS Builds 19044.6216 and 19045.6216)
2. August 19, 2025—KB5066188 (OS Builds 19044.6218 and 19045.6218) Out-of-band

Key Issues Addressed: The following is a summary of the key issues addressed by this update.

• [Common Controls]: Fixed—An issue affecting how certain supplementary characters appear in Windows textboxes.
• [Input and Composition]: Fixed—An issue with the Chinese Simplified Input Method Editor (IME). Some extended characters were displayed as empty boxes.
• [Licensing]: New! This update introduces a new feature enabling customers using the Windows 10 keyless Commercial ESU solution, alongside a Windows 365 subscription, to block outbound network traffic. This enhancement supports compliance with Zero Exhaust policies.
• [Mobile Operator Profiles]: Updated -Country and Operator Settings Asset (COSA) profiles have been updated.
• [Multimedia]: Fixed—An issue where mf.dll failed to enumerate redirected web camera devices in Remote Desktop Services (RDS) environments.
• [Windows Hello]: Fixed—An issue where Narrator incorrectly read the name of the "Enhance Facial Recognition Protection" check box under the Facial Recognition setting.
• [Search pane]: Fixed—An issue that might cause the Windows Search pane to not display the preview pane correctly.
• [Family Safety]: Fixed an issue where the "Ask to Use" approval flow was not triggered for blocked apps. With this fix, the approval flow now appears as expected when a blocked app is accessed.
• [Portable Devices]: Fixed an issue that affected the functionality of the Removable Storage Access policy.
• [Windows Backup for Organizations]: New! Windows Backup for Organizations is now generally available. This solution enables seamless device transitions with enterprise-grade backup and restore, ensuring business continuity and organizational resilience.

Update Notes: If you have previously installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.

Known Issues in this Update:

1. Network Device Interface streaming performance issue

   • Symptoms: After installing the August 2025 Windows security update (KB5063709), you may experience delays or uneven audio and video performance when using Network Device Interface (NDI) to stream or transfer feeds between PCs.
   • Streaming apps like OBS Studio (Open Broadcaster Software) and NDI Tools suffer from this issue, particularly when the source PC has Display Capture enabled. The problem can even occur under low-bandwidth conditions.

2. Workaround: To work around this issue, NDI recommends manually changing the NDI Receive Mode to use TCP or UDP instead of RUDP. For steps to do this, see the NDI support site: Traffic Drops After Windows Update.

3. Next Step: The issue is currently under investigation, and additional information will be shared as soon as it becomes available.

August 26, 2025—KB5063842 (OS Build 19045.6282) Preview

August 26, 2025—KB5063842 (OS Build 19045.6282) Preview - Microsoft Support