How to Download and Install the Windows 11 LTSC Cumulative Update via UUPDump

Microsoft announced that the Windows 11 LTSC (Long‑Term Servicing Channel) version will be officially released in the second half of 2024, but only leaked builds are currently available online.

The LTSC edition is a streamlined version of Windows Enterprise that receives only security and reliability updates for 5‑10 years, without feature upgrades, the Microsoft Store, or other consumer‑focused apps.

Existing LTSC releases based on Windows 10 include LTSB 2015, LTSB 2016, LTSC 2019, and LTSC 2021. The only leaked Windows 11 LTSC build is 26100, which is a candidate for the upcoming 24H2 RTM release.

To obtain the latest cumulative update for this build, use the UUPDump website (a third‑party service that pulls files from Microsoft’s official servers). If the site is inaccessible, you can add 104.25.92.61 uupdump.net to your hosts file or use the domestic mirror https://www.uupdump.cn .

On the UUPDump homepage, search for the keyword “24H2”. In the results, locate files whose names contain “Cumulative Update” and the architecture “amd64” (or “arm64” for ARM devices). Choose the .msu package (e.g., 26100.560) – .cab files require additional tools and are not covered here.

After downloading, the file may appear without an extension. Rename it to have a .msu suffix, then double‑click to install. Follow the on‑screen prompts and restart the computer when prompted.

Optionally, the .msu file can be integrated into an offline ISO using DISM commands, allowing you to upgrade the system without an internet connection.