Windows 10 August 2025 Update Preview: Build 19045.6156 (KB5062649) Released

Overview of Windows 10 Build 19045.6156

Microsoft has rolled out Windows 10 build 19045.6156 (KB5062649), a non-security preview update for version 22H2. This update is currently available to devices in the Release Preview Channel and is anticipated to be part of the August 2025 Patch Tuesday update.

Key Features and Fixes

This build primarily focuses on enhancing system stability.
It addresses issues related to the Extended Security Updates (ESU) enrollment wizard, where users encountered problems with the “Enroll now”button.
Significantly, this update incorporates WeUSiPolicy Secure Boot protections designed to prevent the rollback of vulnerable system files.

The official release notes specify that no new features have been introduced in this build. Instead, it aims to resolve existing issues and bolster system security through various updates.

Enhanced Security Measures

This preview update facilitates the deployment of VBS Anti-rollback protections via the WeUSiPolicy, which can be activated through the Secure Boot “AvailableUpdates” Registry key. The SKUSiPolicy.p7b is a revocation policy, signed by Microsoft that aims to prevent older, potentially vulnerable VBS system files from loading. This effectively stops attackers with administrative privileges from downgrading system files to vulnerable versions.

Once this security policy is implemented, it can be locked to the UEFI firmware of the device, ensuring its persistence even across system reboots. The application of this policy will enhance the operating system’s resistance to security threats.

Additional Updates

The build also resolves stability issues that some users experienced following the May 2025 security update. Additionally, the update modifies the Country and Operator Settings Asset (COSA) profiles for improved functionality.

Update Naming Convention

It’s important to note that Microsoft refrains from assigning specific names to updates released in the Release Preview Channel. Once these updates proceed to the Stable Channel and are officially labeled, they will be identified during the Patch Tuesday release. The upcoming update will ultimately be recognized as the “August 2025 Security Update.”

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Installation Guide for Windows 10 Build 19045.6156

To proceed with downloading and installing this quality update, enroll your device in the Release Preview Channel. Navigate to the “Windows Update” settings, activate the “Get the latest updates as soon as they’re available” option, and click the “Check for Updates” button. Keep in mind that the update may take some time to appear on your device as Microsoft gradually rolls it out.

Windows 10 End of Support Timeline

Microsoft has revealed that support for Windows 10 will officially conclude on October 14, 2025. Although maintenance updates continue to be available, users should be aware that post-October 2025, there will be no further security updates, bug fixes, or technical support provided for Windows 10. This cessation of updates could expose your systems to security vulnerabilities and potentially degrade performance.

With the discontinuation of updates, users are strongly advised to consider upgrading to Windows 11, transitioning to other operating systems like Linux Mint, or even planning to acquire new hardware.

For those who wish to continue utilizing Windows 10, Microsoft now offers Extended Security Updates (ESU).Initially designed for organizations requiring legacy support, this service has now been made available to regular consumers.

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