An iMac 14,2 shipped with Mac OS X 10.8.4 preinstalled (iMac "Core i5" 3.4 27-Inch (Late 2013) Specs (Late 2013, ME089LL/A, iMac14,2, A1419, 2639) @ EveryMac.com ). If you're still running that version of OS X, the newest version of Premiere that you'll be able to run is CC 2014. If you're running Mac OS X 10.9.5, the newest version of Premiere that you'll be able to run is CC 2015. If you're running Mac OS X 10.12, you'll be able to run CC 2017. You should be able to upgrade to macOS Sierra 10.12 for free via the App Store; however, if you have the ability to make a bootable backup of your Macintosh HD before you upgrade, do so. Depending on the software that you're currently running, OS upgrades can go smoothly or be a complete train wreck. -Warren
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