I don't know how many of you are using Pages from Apple.
If I can give you an advice, before upgrading, look at the below thread in Apple Support and see what is gone.
I for me I encountered some major losses. And apparently this is the same with Numbers and Keynote.
Why does Apple get rid of so many useful features in new pages?
I looked in my application folder and found the old version I was using in the file "iWork '09".
So I just deleted the new app, restarted my computer "et voilà!" back to normal.
But beware that document saved under the new Pages will not be usable with the old one. So either do a restore from your back up or a "revert to" before deleting the new application.
Or maybe time to go back to MS Word ;-)
déconstruire les expériences humaines pour apprendre, comprendre et apporter des solutions.