Why I cannot download iOS 7.1?
Am unable to download the new iOS 7.1. Why?
MacBook Air, iOS 6.1.2
If you are having issues using OTA (over the air)
Do the Update using iTunes on your Computer.
See the Using iTunes Section Here...
How to update your iPhone, iPad, or iPod touch
Make sure you have the Latest Version of iTunes (v11.1.5) Installed on your computer
iTunes free download from www.itunes.com/download