Microsoft's Patch Tuesday update for Windows 11, KB5089549, released on May 13, 2026, has caused installation issues for some users, who receive an error message indicating a rollback. Additionally, a smaller group has reported decreased internet performance after the update. Users facing installation failures may see the system revert to the previous version automatically and can attempt to reinstall the update or troubleshoot by clearing the SoftwareDistribution cache or using the Windows Update troubleshooter.