I've tried in settings I've tried turning of and on it says can't download, then gives me the option of cancel or retry and this repeats over and over.
Dude I use an iPod touch 4 and trust me i have faced the same problem if you were downloading the app through wifi then disconnect the connection and again re-connect it and if you were using cellular data just try taking the sim card out and put it back in again it will automatically disappear