31 Dec 15 I've looked for an answer to this question on the forums but have not found it exactly as I need it. I have an I Mac running 10.6.8 Snow Leopard - very well I might add - and last year I tried to install Turbo Tax via a CD and it would not load because my OS was not a new enough version. I had to use my wifes P.C. Laptop to do my taxes. So here it is time for my taxes again and sure enough, the CD needs to be using a version 10.9 or newer to install and run. I checked the Apple Apps Store and there is a free download of El Capitan available but when I checked the reviews, there area a lot of very poor ratings for this OS. I don't want to do an upgrade to 10.11 and then regret it. If I do the upgrade and it is not very good, how can I go back to my Snow Leopard? I did a full back up of my hard drive onto my G Tech external drive. It was done using Super Duper and not Time Machine. If neccessary, could I reformat my hard drive to eliminate E.C. and then reload everything that I have on my external hard drive so that I would be back to where I was prior to the E.C. install? I really don't know how I would do that. (Senior Citizen - need I say more ?) So I suppose that my questions are: If I up grade to E.C. and then decide it's not for me, can I revert to my prior version of 10.6.8 O.S.? If I can do that, how exactly do I do it? Should I up load all of the photos in I Photo to the cloud before I try anything? Just to be sure not to loose them. I just don't want to do something that I can't reverse. I would appreciate any and all advise from you in this matter. Thank you. Keats Peoria, Az.