What version of Mac OS should I run? Posted on April 22, 2013 Posted in Macintosh What version of Mac OS X should I be running? Here are my basic recommendations to all of my clients. To find your version click the Apple menu > About This Mac. Instant BookingIf you need further help with this topic or any others, and if you are located in the Washington DC area, I encourage you to book a private appointment with me. If you are not in the DC area you may wish to locate a Macintosh professional nearby.