Windows 11’s May update is causing install failures and slow internet - here’s what we know

Key Points:

• Microsoft's KB5089549 Patch Tuesday update for Windows 11, released on May 13, 2026, is failing to install on some systems, with affected users reporting repeated installation attempts followed by automatic rollbacks to the previous version.
• The installation failure triggers an error message but does not cause widespread boot failures or corrupted installations, as Windows 11 recovers automatically through the rollback process.
• A smaller subset of users also report internet speed slowdowns after installing the update, though it remains unclear if this is a widespread networking issue or related to other factors such as hardware or network equipment.
• Microsoft has not officially acknowledged these problems, and their health dashboard does not list any known issues related to this or other recent updates.
• Users experiencing installation failures are advised to retry the update, clear the SoftwareDistribution cache, run the Windows Update troubleshooter, or disconnect nonessential peripherals, while those facing internet slowdowns may try restarting network adapters or reinstalling drivers; otherwise, waiting for the next cumulative update is recommended.