Controlling Automatic Downloads
You iPad can automatically download app updates when they become available. This saves you from missing an update to your favorite apps. You can also set your iPad to download new content that you purchase from iTunes on another device.
Open the Settings app and tap iTunes & App Store on the left.
There are three switches that control automatic content downloads. Turn these on if you want your iPad to automatically get music, apps, or books when you purchase them on another device, such as your computer or an iPhone.
Turn on Updates if you want updates to Apple and third-party apps to automatically download and install.