First disable any power saving on the computer using Settings - Power. That should prevent the stall, which may be due to the computer shutting down rather than finishing the download and install process. Then try one more time. If it does not work, go to https://support.microsoft.com/en-us/help/4027322/windows-update-troubleshooter. download and run the troubleshooter and try again.
Good luck.
Please do not write bullshits like that in this topics. This troubleshooter is a very old one and was thousends times failed to help - similarly like the other tips written here.
Just the moment I am "standing in queue" for the 3rd level Microsoft support with this problem
I am personally waiting for a general solution from the side of Microsoft technicians: new "feature UpDate" ????