Select the MacOS you are using:
Pre-MacOS Sierra (Mountain Lion, Mavericks, Yosemite, El Capitan) >> Click here
MacOS Sierra, High Sierra and Mojave (released sept./2018) >> Click here
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How to check your MacOS version?
- Click on the Apple icon in the top left corner of your screen.
- Click on “About this Mac“.
You will see a popup with your OS and its version.