I'm sorry if this is not the proper board to post on, could not find an alternative. I was just editing a PDF for the last four days (it's a huge, multi-page PDF) and just finished this morning. I accidentally saved over all of my work with an older PDF of the same name (the unedited version). I am trying to figure out if there is a way to turn off my computer or undo ALL of what I've done since I last turned it on? I do not have time machine (as obviously that would be the solution). Am working on version 10.4.11. I truly hope i haven't lost all I've worked on! please help!!