Thread:Mainframebabe/@comment-30339728-20161111124637/@comment-29954643-20161111144229

I did a quick search myself and I guess that an update file is delivered to phone, and then that update file is installed. This article suggest downloading to a computer and installing app on the phone from the fiel on the computer via a USB cable.

http://forums.imore.com/guides-how-articles/267116-guide-i-don-t-have-enough-storage-update.html