Windows 11 26H2 Is Now Available for Eligible 24H2 and 25H2 PCs

Windows 11 version 26H2, also called the Windows 11 2026 Update, is now broadly available to eligible PCs running versions 24H2 and 25H2. Microsoft began the rollout on September 29, 2026, and expanded availability in stages. The update is not a complete operating-system reinstall for supported 24H2 and 25H2 systems: it is delivered as an enablement package that activates features already present in the shared servicing baseline.

That means installation is usually quick and requires a restart. However, “available” does not mean every device must install it immediately. Microsoft can continue to apply safeguard holds when a known driver, application, or hardware compatibility issue could affect the update.

What is Windows 11 26H2?

Windows 11 24H2, 25H2, and 26H2 share a common core operating system and servicing branch. Many components and improvements associated with 26H2 are delivered through monthly cumulative updates first. The enablement package switches on the version-specific features rather than downloading a complete replacement operating system.

Microsoft describes this as a lower-disruption update path: eligible devices receive a relatively small package and transition to 26H2 with one restart. The exact size depends on the update channel and device state, so avoid relying on a fixed download-size claim.

Version 26H2 includes the latest Windows innovations and quality improvements. Microsoft’s release notes identify changes across security, management, accessibility, and productivity. Some capabilities were introduced gradually in prior monthly updates, so visible differences after enabling 26H2 vary depending on which updates were already installed.

Eligibility and prerequisites

• The device must already run Windows 11 version 24H2 or 25H2 to use the enablement-package upgrade path.
• Install the required September 22, 2026 preview cumulative update, KB5124010 (or a later cumulative update), before applying the package where that prerequisite applies.
• The PC must not be subject to a Microsoft safeguard hold for a known compatibility issue.
• Keep the device connected to power and back up important files before installing a feature update.

Method 1: Install Windows 11 26H2 through Windows Update

For most home and business users, Windows Update is the recommended method. It checks eligibility and respects Microsoft’s rollout safeguards.

After the restart, Windows should report version 26H2. The update option may not appear on a device that is not yet eligible or remains under a safeguard hold.

Method 2: Install the enablement package from Microsoft Update Catalog

Administrators who need to obtain the package separately can use the Microsoft Update Catalog. Microsoft documents KB5121794 as the feature update to Windows 11 version 26H2 by using an enablement package.

1. Open the official Microsoft Update Catalog.
2. Search for KB5121794.
3. Choose the package that matches the device’s Windows edition and architecture, where applicable.
4. Download the package and follow Microsoft’s installation guidance for the applicable update file.
5. Restart the device when prompted.

Do not download enablement packages from third-party file-sharing sites. For managed environments, Microsoft also documents distribution through Windows Server Update Services (WSUS), with the Windows 11 product and Upgrades classification configured.

Why Windows 11 26H2 may not appear

• Unsupported starting version: confirm the PC is running 24H2 or 25H2. The enablement package is not intended to jump directly from every older release.
• Missing prerequisite update: install KB5124010 or a later cumulative update as specified in Microsoft’s KB5121794 documentation.
• Safeguard hold: Microsoft may temporarily withhold the update if telemetry identifies a compatibility issue. Check the Windows release health dashboard for known issues and safeguard details.
• Managed update controls: organizations using WSUS, Windows Autopatch, or other update-management tooling should check deployment rings, approvals, and feature-update policies.
• Update scan or service issue: restart the PC, check internet connectivity, and run the Windows Update troubleshooter before attempting a manual package installation.

Verify that Windows 11 26H2 is installed

After the restart, use either of these checks:

Option 1: Use winver

1. Press Windows + R.
2. Type winver and press Enter.
3. Confirm the dialog reports Version 26H2.

winver

Option 2: Check Settings

Open Settings → System → About and review the Windows specifications section. It should show Windows 11, version 26H2. The OS build number can change as monthly cumulative updates are installed, so do not expect every updated PC to display the same build.

Final thoughts

Windows 11 26H2 is a relatively straightforward upgrade for eligible 24H2 and 25H2 systems because Microsoft delivers it through an enablement package on the shared servicing foundation. Start with Windows Update, use the Microsoft Update Catalog when a managed or manual deployment is required, and respect compatibility safeguard holds. A quick winver check confirms whether the upgrade completed.

References and official documentation

1. Microsoft Windows Experience Blog — How to get the Windows 11 2026 Update
2. Microsoft Support — KB5121794: Feature update to Windows 11, version 26H2 by using an enablement package
3. Microsoft Support — Windows 11, version 26H2 update history
4. Microsoft Learn — Windows release health