I made the mistake of following instructions to try out things while reading the "Getting-started" Help file that comes with Numbers. I'm using a new iPad 3rd Generation. I never guessed that I would be making permanent changes to the master file without a "Do you really want to do this?" challenge. So now I've made a mess of the delivered Help file, having been adventuresome and tried a lot of things, and I would like to restore the original undamaged Help file for my day to day continuing reference. How do I do that? Or, where can I go to download the original?