OK here is another problem. Assuming that you change the updating to be manual. But you pressed on "Check for updates" nonetheless and the download started !

http://i.imgur.com/NASYCbe.png

http://i.imgur.com/nuERh1a.png

Now you want to stop the downloading for any reason !. It takes all my bandwidth and I wanted to some other installation or downloading or whatever reason. There is no stop button. However, one of the solutions Windows provided indirectly is the firewall !!. Simply click on start and type "Firewall".

http://i.imgur.com/fc6grkU.png

Choose "Windows Firewall With Advanced Security". No we will do two new rules on the firewall to stop the download. One is more than enough but two will definitely be absolute in case the connection/download already started. First and most important rule is the outbound rule.

http://i.imgur.com/nk2i3ro.png

On the program tab, click "Customize"

http://i.imgur.com/RAF9QKi.png

Now select the Windows Update service

http://i.imgur.com/2JIsFKL.png

Keep going and make sure the block connection choice is what you choose

http://i.imgur.com/cB87OC9.png

Finally name the rule anything you want and you can enable/disable the rule anytime you want

http://i.imgur.com/aC69kwE.png

btw, once you make the rule and it's enabled, you will see that Windows Updates are still downloading but the traffic is blocked by the firewall and you can verify this in the task manager as in the following screenshot

http://i.imgur.com/Jdd7DK7.png

You can do inbound rule the exact same way. I found it unnecessary but I like being sure