I have searched everywhere to my particular question and didn't get a good answer. I had OSX Snow Leopard, saw that the upgrade to OSX Mavericks was free and downloaded it. A ton of my programs don't work now, go figure. I would like to downgrade but not back to OSX Snow Leopard but to OSX Lion or OSX Mountain Lion. Will my files and programs erase when I do this? I didn't back up anything either.