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.
"Windows updates installed using the Windows Update Standalone Installer (WUSA) might fail with error ERROR_BAD_PATHNAME, when the update is installed using WUSA or double-clicking a .msu file from a network share that contains multiple .msu files," Microsoft said when it acknowledged the issue in August 2025.
"These issues might occur on devices that installed updates released May 28, 2025 (KB5058499) and later."
