How can I download Windows Update in Windows 10?

 Sometimes you are not able to download Windows Update. Without Windows Updates chances are your computer/laptop is not working well.

This screen shows the related issues with Windows Update.

Before getting into more diagnostics and web searches you make sure this service is turned in the Control Panel's Services window.

This service is by default 'Manual'. You can 'Start', "Stop" or "Restart" this service in the Control Panel-> Services node.

If you look closer this Windows Service requires another service "Remote Procedure Call" running.

In the Control Panel's Services node you can 'Start', "Stop" or "Restart" this procedure is also "Manual" by default.

If you have to do any of the above, you must have administrative rights over the computer/laptop. 

Even after doing all this if the Windows Update does not work, you should look for other problems.

What if I do not find Remote Procedure Call Service (RPC) on my Windows 10?

It can happen as it happened to me that the RPC service line item may be missing in the Windows 10 Professional.

RPCss is the Service Control Manager (SCM) for COM and DCOM servers. It performs object activation requests, object explorer resolutions and distributed garbage collection for COM and DCOM. Programs on the local computer and or on a remote computer may fail if it is not working.

You should find this in Control Panel|...|Services.

By default RPC will be running as NT Authority\NetworkService, a shared process of svchost. If it fails error is logged.

If it is absent you can get it from here:
http://batcmd.com/windows/10/services/rpcss/

Note. Make sure that the rpcss.dll file exists in the %WinDir%\system32 folder.

If this file is missing you can try to restore it from your Windows 10 installation media.