Things You'll Need
Instructions
Launch iTunes on your computer and click "iTunes Store" in the program's side window.
Click "Apps" in the iTunes Store window and type "Call of Duty: Zombies" in the search field in the upper-right corner of the window.
Click "Buy" and enter your iTunes Store account's password. Click "Buy" to download the game to your iTunes library.
Connect the iOS device to your computer's USB port using the USB device cable.
Click the device's name in the iTunes side window and click "Apps" in the main iTunes window.
Click the check box next to "Call of Duty: Zombies" and click "Apply" in the lower-right corner of iTunes.
Remove the USB cable from the iOS device after the synchronization finishes.