It looks like when you receive the following error, “Download failed.: Failed writing body”, WordPress is trying to tell you something very important. What is it? Simple. You hard drive is full. Makes sense doesn’t it? Not at first, but after some Google-Fu, I came up with the following page at WordPress.org: http://wordpress.org/support/topic/wired-worpress-error
Thanks to those who (unfortunately) came before me and already solved this problem. Now I have to go and finish removing files so I can update WP.