Microsoft has fixed a known issue that caused Windows updates released since May 2025 to fail when installed via the Windows Update Standalone Installer (WUSA) from a network share.

WUSA is a built-in Windows command-line tool that helps admins install and uninstall Microsoft Standalone Update (.msu) files through the Windows Update Agent API to deploy or remove patches, updates, and hotfixes.

This known issue affects Windows 11 24H2/25H2 and Windows Server 2025 devices on enterprise networks, as WUSA isn’t a common method for installing updates on home devices. Microsoft also noted that the bug doesn’t occur with a single.msu file or when the files are stored locally.