How can I update Windows 11 23H2 to 26H2 or 26H1 now?

This is the post for Windows 11 upgrade from old versions:

https://www.devshowto.com/windows-11-26h1-upgrade

Upgrading from 23H2 to 26H2 is designed to be straightforward, but there are critical errors you need to avoid to prevent a failed installation or an unstable system.

Attempting to upgrade too early

What It Means: The general availability of 26H2 is expected between late September and October 2026. Trying to force it before the official rollout or via unofficial preview builds (e.g., through unsupported methods) can lead to instability. Microsoft uses a phased rollout to catch hardware-specific bugs first.

How to Avoid It: Wait for the official release and for Windows Update to offer it to your device. Only use preview builds on non-critical machines

Forcing the upgrade via ISO instead of the Enablement Package

What It Means: Because 23H2, 24H2, and 25H2 share the same core system files, the upgrade to 26H2 is delivered as a tiny Enablement Package (eKB) that simply "turns on" the new features. This package is only 174 KB and installs like a regular monthly update. Using a full ISO will trigger an unnecessary and lengthy full OS reinstall, which carries a much higher risk of failure.

How to Avoid It: Let Windows Update handle the upgrade. When you update Windows 11 23H2 to 26H2 via the enablement package, the process is quick and requires only one restart.

Ignoring driver compatibility issues

What It Means: Starting with the 26H2 base (build 26300), Windows will enforce stricter driver signing rules. This change, which has been in the works for years, will block any kernel-mode driver that is not signed under the Windows Hardware Compatibility Program, effectively breaking legacy hardware and peripherals with unsigned or outdated drivers. You have a 100-hour "audit mode" after installation to identify and replace incompatible drivers before they are fully blocked.

How to Avoid It: Before you upgrade, inventory all your hardware (especially older peripherals, security tools, and virtualization agents) and check with the manufacturer for signed drivers. Do not attempt to update Windows 11 23H2 to 26H2 on a machine with known legacy driver dependencies.

Media Creation Tool is Microsoft’s official system utility that you can use for update Windows 11 23H2 to 26H2, and it also supports generating bootable USB‑drive or ISO image files for system deployment on multiple computers.

How to Update Windows 11 23H2 to 26H2

Step 1: Download the software from the official Microsoft website.

Step 2: Run the program, select “Upgrade this PC now,” and then follow the on-screen prompts to download and complete the system installation.

Step 3: To perform a clean installation, select “Create installation media for another PC.”

Step 4: Select a USB flash drive or ISO file as the target media, and complete the creation of the installation media.

Finally, boot the target device from the prepared USB media to perform a clean installation of Windows.

This allows you to upgrade your current computer or create reusable installation media for other devices. This method is suitable for users who need to reinstall Windows, administrators deploying multiple PCs, and hardware devices that have not yet received the new version via Windows Update.

Keeping Windows updated to a newer version can sometimes be difficult when Windows Update does not offer the latest build directly. In that situation, users may look for alternative ways to download official installation files and create their own update media. This can be useful for tasks like update Windows 11 23H2 to 26H1.

UUP Dump is a web-based tool that collects Windows Update files and allows users to create ISO images from official update packages. After selecting the desired Windows version, language, and edition, it generates a download script that can be used to build an installation image.

The general process is to choose the target build, download the package files, run the provided script, and wait for the ISO creation to finish. The generated ISO can then be used for upgrading or reinstalling Windows. For users who want to update Windows 11 23H2 to 26H1, this provides another way to access newer builds.

Windows 11 Installation Assistant is Microsoft’s official desktop utility that you can use for update Windows 11 23H2 to 26H2, skipping phased roll‑outs to deploy the newest Windows build directly on your computer.

Instructions: Go to the official Microsoft Windows 11 Download Page. Locate Windows 11 Installation Assistant and click Download now. Launch the downloaded executable file, let the tool complete the PC compatibility check, then select Upgrade now. The utility will automatically download and apply the newest stable system build to update Windows 11 23H2 to 26H2.

Its advantages include: official trusted Microsoft source, fast upgrade workflow, keeps all your local files, programs and personal settings intact, no third‑party software required.

Its drawbacks include: it can only install current stable release versions and cannot install insider preview builds; a stable internet connection is required for large‑size system file download.

Notes

• Before beginning the upgrade process, make sure your computer meets the hardware requirements for Windows 11.
• Connect your computer to a reliable power source; avoid power outages during installation.
• Close resource-intensive applications running in the background to prevent the upgrade from being interrupted.
• Ensure you have sufficient disk space; the system drive must have at least 20 GB of free space.

This allows you to manually trigger immediate Windows version upgrades without waiting for staggered Windows Update deployment. It is suitable for users who want to jump to the newest stable Windows release right away, and devices that have not yet received the new‑build push via automatic Windows Update.

To update Windows 11 23H2 to 26H1. If you prefer a more manual and "challenging" approach, you can perform the upgrade entirely offline using official Microsoft update files.

Download the ISO from Microsoft: The most straightforward offline method is to get a Windows 11 ISO file that contains the version you want.

Use Microsoft Update Catalog: This is the official source for standalone update packages (.msu and .cab files). You can search for specific update Windows 11 23H2 to 26H1 for your system version and install them.

Install with DISM or PowerShell: If you want a truly command-line-driven experience, you can use the built-in Deployment Imaging Service and Management Tool (DISM) or PowerShell's Add-WindowsPackage to install these updates directly. These commands bypass the standard Windows Update service and allow you to inject the update directly into your system image.

The Windows Feature Upgrade Tool (wfu-tool) is a free, open-source PowerShell tool created for this exact purpose . It can help you update Windows 11 23H2 to 26H1, but using it comes with important conditions and limitations.

The most significant issue is the nature of the version you want to reach. Windows 11, version 26H1, is a special release:

• Limited Scope: It is designed primarily for new devices with specific hardware and is not offered as an in-place upgrade from existing versions like 23H2, 24H2, or 25H2 .
• Different Core: Version 26H1 is built on a different Windows core than the standard annual feature updates . This means it does not follow the usual upgrade paths and will not be a typical update for general users.

Technically, yes. A tool like wfu-tool can attempt to update Windows 11 23H2 to 26H1 by forcing a full install using the 26H1 ISO . However, this bypasses Microsoft's intended design.

The key risk is that Microsoft explicitly states that devices on version 26H1 "will not be able to update to the next annual feature update" (like 26H2) . You would be effectively moving your PC onto a dead-end branch that locks you out of future standard feature updates.

Joining the Windows Insider Program is currently the most direct, officially supported path to update Windows 11 23H2 to 26H2, since version 26H2 is still in preview and hasn't been released to the general public . However, whether you should do this depends heavily on your current system and your tolerance for risk.

The experience of upgrading to Windows 11 23H2 to 26H2 is not the same for everyone. It depends entirely on which version of Windows 11 you are currently running.

• If you are on Windows 11 24H2 or 25H2: Your computer shares the same core codebase as 26H2. Upgrading is a breeze, requiring a tiny 174 KB "enablement package" that flips a switch to activate new features . The process is fast and requires just one restart .
• If you are on Windows 11 23H2 or older: You do not share that codebase. To upgrade Windows 11 23H2 to 26H2, you must install a full feature update, which is roughly 6.5 GB in size, takes much longer to download and install, and may require multiple restarts.

If you are prepared to test a preview, here is the path to update Windows 11 23H2 to 26H2 through the Insider Program:

1. Sign in with a Microsoft account: Your PC must be using a Microsoft account, not a local one, to enroll in the Insider Program .
2. Navigate to Settings: Go to Settings > Windows Update > Windows Insider Program .
3. Join the program: Click "Get started" and link your Microsoft account.
4. Select the correct channel: Choose the Experimental channel. This is where 26H2 preview builds are being tested . You may see an option labeled "Windows 11, version 25H2" as the target; this is the correct selection for the current 26H2 builds .
5. Check for updates: Restart your PC and then check for updates. Windows Update should offer you the 26H2 preview build.

Joining the Insider Program is the right way to update Windows 11 23H2 to 26H2 early, but you must be prepared to test unfinished software on a non-critical device. If you just want the stable version, it's safer to wait for the general availability expected in the fall of 2026 .