Let it sit there even if it takes overnight to complete. It will eventually complete. I have had the same experience on one of my machines. Went to bed and the next morning it was done.My S3 TH2 update stuck, as it does not show up in WU, so I tried with MCT to upgrade from current 10240 build. Download went fine then it stuck at 40%. Forced shutdown and reboot, it restore back to 10240. Tried one more time with MCT and same result. Anyone have same issue, maybe I should try clean install with ISO. View attachment 7242
After that long your options are limited. Hold the power button until it shuts down and restart.My Pro 3 has been stuck on the "Updating Windows " screen for 8 hours !!! how do I reboot?
Gary