How to Fix Windows 11 Updates Stuck at 100% Without Losing Your Stuff
If the update screen has not changed for 45 minutes, hold the power button to shut down, then on the next boot tap F8 or Shift+F8 repeatedly and choose Safe Mode with Networking. Once in, run Windows Update Troubleshooter and then free at least 10 GB by clearing Downloads and old installers before trying the update again, which prevents the same stall from happening twice.
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