iTunes 10.3 and iOS 4.3.3 or later enable you to automatically download purchases from the App Store, iBookstore, or iTunes Store. You can use Automatic Downloads to instantly download purchases to your other computers and devices.  Note: Downloading of past purchases and App updates are not supported by Automatic Downloads.  We’ve put together a short tutorial to help you set this up both on your mobile device and your Mac, read more below… Authorize First you will need to open iTunes on your Mac. Make sure the computer you are using has been authorized to play nicely with your Apple ID. To do this, go to Store then Authorize This…