I am using W10 and want it to update. It currently shows no updates installed. I know I turned this off originally for a specific reason but in error I cloned the wrong drive as a backup so I now have 2 that are not updated.
Right click start, select run and type services.msc. Scroll down to Windows update and right click. Select properties. Startup type should be manual (trigger start). If it is already set to that but doesn't start when you check for updates try starting the service first.