Here's how you can disable automatic app updates in Windows 8. Automatic updates can be useful, but they can also devour bandwidth behind your back.
1. Go to the Start screen.
2. Go to the Windows Store.
3. Press Windows-C to access the Charms bar.
4. Go to Settings.
5. Go to App Updates.
6. Toggle the "Automatically update my apps" switch to the Off position.
How much bandwidth can you save? That depends largely on the apps that you have installed, how frequently they are updated, and how large those updates are. It is likely that this will fall in the Megabyte range instead of the Gigabyte range.More at Ghacks
Additional resources for Windows 8