Winsage
June 12, 2026
Microsoft resolved an issue affecting the installation of Windows updates released since May 2025, which primarily impacted users using the Windows Update Standalone Installer (WUSA) from a network share, especially in enterprise environments. The problem was significant for devices running Windows 11 24H2/25H2 and Windows Server 2025, but did not occur when handling a single .msu file or when files were stored locally. In August 2025, Microsoft acknowledged that updates installed using WUSA might fail with error ERRORBADPATHNAME when multiple .msu files were involved. A Known Issue Rollback Group Policy was implemented in September 2025 to mitigate the impact on home and non-managed business devices. The issue was ultimately resolved with cumulative updates released in June 2026 for Windows 11 (KB5079391) and Windows Server 2025 (KB5094125). Microsoft provided a workaround for users experiencing difficulties with prior updates by suggesting they save .msu files locally for installation. Users were also advised to wait at least 15 minutes after installing an .msu file via WUSA before checking the Update History page. Additionally, Microsoft had previously addressed another issue in April 2025 that affected enterprise customers installing security updates via WSUS, which recurred in the August 2025 updates. Microsoft warned customers about potential issues with installing the latest monthly updates on devices upgraded to Windows 11 24H2 or 25H2.
