Delete everything from the sub-folder Download
Go to This PC and open the partition you have your Windows installed on (it’s usually C:).
Go to the Windows folder.
While here, find the folder named Softwaredistribution and open it.
Open the sub-folder Download and delete everything from it (you might need administrator permission for the task).
Now go to Search, type update, and open Windows Update Settings.
Go to Advanced Options and set Notify to schedule restart under Choose how updates are installed.