Microsoft released preview cumulative update KB5079391 for Windows 11 24H2 and 25H2, delivering 29 non-security changes including Smart App Control and several display and reliability fixes. The optional March 2026 update lets users toggle Smart App Control without reinstalling and adds support for >1000 Hz refresh rates, native USB4 monitors, and other stability improvements. #KB5079391 #SmartAppControl
Keypoints
- KB5079391 is an optional, non-security preview update for Windows 11 24H2 and 25H2 that will test features before Patch Tuesday.
- The update allows toggling Smart App Control on or off without a clean install via Settings > Windows Security > App & Browser Control.
- Display improvements include support for monitors reporting refresh rates over 1000 Hz, native USB4 connections, and better HDR reliability.
- Performance and reliability fixes cover Windows RE on ARM64 for x64 apps, Windows Hello fingerprint reliability, and updated Settings dialog designs.
- You can install the update from Settings > Windows Update or the Microsoft Update Catalog; installation is optional unless automatic updates are enabled.