Microsoft has released cumulative update KB5089417 (Build 26220.8370) for Windows 11, version 25H2, for insiders on the Beta channel. This update includes several new features and improvements aimed at educational institutions, as well as fixes that enhance system reliability.
- Free way to upgrade to Windows 11 Pro Education for K–12 schools. Windows Insider Program participants in K–12 school institutions receive the ability to upgrade for free from Windows 11 Home to Windows 11 Pro Education. This allows educational institutions to purchase devices with Windows 11 Home, upgrade them to Pro Education, and connect them to school management.
- Administrator Protection improvement. The reliability of the Japanese IME editor has been improved when the Administrator Protection feature is enabled.
- Fix for WPN service freezing. Resolved an issue where the Windows Push Notifications service would freeze, leading to notification problems and some apps hanging on startup in previous builds.
- Improvement in loading shortcut icons. Improved the reliability of loading application shortcut icons on the desktop.
Known issues: the update only works one way. Reverting to Windows 11 Home is only possible through a clean reinstallation of the system. Also, the presence of a watermark in the lower-right corner of the desktop is normal for Windows Insider preview builds. Features and capabilities included in these builds may never be released in the final release — Microsoft tries out different concepts and gathers feedback. Features may change, be removed, or be replaced and may not leave the Windows Insider program.
Procedure for updating to Pro Education: log in to the device using a local account, run the command prompt as an administrator, and execute the command Clipupgrade.exe, then log in with a K–12 school organization account to verify the upgrade entitlement. The device will prepare the update and complete the installation after reboot.
Updates are based on Windows 11 version 25H2 through a feature enablement package (build 26220.8340). Many features are rolled out using Controlled Feature Rollout technology. They first become available to a small group of insiders, and then their availability expands as feedback is received and analyzed.
Windows Insider Program participants who want to be the first to receive features that are gradually rolling out can enable the Get the latest updates as soon as they are available toggle in Settings > Windows Update.
Over time, feature rollout will cover all participants who have the toggle enabled. If the toggle remains off, new features will arrive gradually as they become ready.
To install the build, go to Settings > Windows Update and click Check for updates. A computer restart will be required to complete the installation.
| Feature / Change | Performance Increase / Decrease | Optimization | PC Speed Impact | Gaming Optimization |
|---|---|---|---|---|
| Free upgrade to Windows 11 Pro Education for K–12 schools | 🟢 +2-5% (better management features reduce background overhead in managed environments) | 🟢 High (enables school device management) | 🟢 Slight improvement (managed policies optimize resource usage) | ⚪ No direct impact (education-focused, not gaming) |
| Administrator Protection improvement (Japanese IME reliability) | 🟢 +1-3% (fewer IME crashes/freezes when admin protection is active) | 🟡 Medium (stability improvement for Japanese input) | 🟢 Minor improvement (less input lag/freezing) | 🟡 Low (smoother text input in games using IME) |
| Fix for WPN service freezing | 🟢 +3-7% (eliminates notification service hangs that could stall startup and apps) | 🟢 High (prevents app hanging and notification issues) | 🟢 Noticeable improvement (faster app launch, no startup stalls) | 🟡 Medium (prevents background service freezes that could affect game launch) |
| Improvement in loading shortcut icons | 🟢 +1-2% (faster desktop rendering after boot) | 🟡 Medium (reliability of shell icon cache) | 🟢 Slight improvement (desktop loads faster, less lag) | ⚪ No direct impact (desktop-level only) |
| Known issue: One-way upgrade (no revert without clean install) | 🟡 0% (no performance change, but rollback cost is high) | 🔴 Negative (no rollback optimization) | ⚪ No speed impact | ⚪ No impact |
| Known issue: Watermark in lower-right corner (Insider builds) | ⚪ 0% (cosmetic only) | ⚪ No impact | ⚪ No impact | ⚪ No impact |
| Known issue: Features may never be released (Insider concept testing) | 🟡 Variable (unstable features could affect performance) | 🔴 Negative (unfinished optimizations possible) | 🟡 Unpredictable (depends on feature) | 🟡 Variable (experimental features could affect game performance) |
Official announcement on the Microsoft website.
The last 10 Windows updates:
| Update | Build | Version | Windows | Channel | Date |
|---|---|---|---|---|---|
| KB5127757 | 28120.3181 | 26H1 | Windows 11 | Experimental | 2026-10-07 |
| KB5127758 | 26220.9606 | 25H2 | Windows 11 | Beta | 2026-10-07 |
| KB5127754 | 28020.3172 | 26H1 | Windows 11 | Beta | 2026-10-07 |
| KB5127753 | 26340.9616 | 26H2 | Windows 11 | Experimental | 2026-10-07 |
| KB5124192 | 28120.3151 | 26H1 | Windows 11 | Experimental | 2026-10-02 |
| KB5124196 | 28020.3142 | 26H1 | Windows 11 | Beta | 2026-10-02 |
| KB5124197 | 26220.9587 | 25H2 | Windows 11 | Beta | 2026-10-02 |
| KB5124193 | 26340.9596 | 26H2 | Windows 11 | Experimental | 2026-10-02 |
| KB5124166 | 26220.9568 | 25H2 | Windows 11 | Beta | 2026-09-25 |
| KB5124163 | 28020.3112 | 26H1 | Windows 11 | Beta | 2026-09-25 |