In an effort to try to do a slide show through my apple TV and my computer I have lost all of my work in iPhono for the past 5 years. I upgraded and lost my albums and books. How do I get everything back the way it was?

In an effort to try and show a slide show through my apple tv I upgraded my iPhoto app now I have lost all of my books albums and photo's over the last 5 years. How can I get it back the way it was 2 hours ago?

to know your version of OS, click on the apple, then  " About This Mac".
Same thing for your version of iPhoto: in iPhoto, click on "iPhoto" then "About iPhoto".

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