what version of os do i have on my mac
Check About This Mac to find the version number and build number of your Mac operating system. Knowing the macOS version number can help you determine whether your Mac is up to date or meets the system requirements of other software or devices. Learn how to update the software on your Mac. From the Apple (ï£¿) menu, choose About This Mac. The version number appears beneath âmacOSâ or âOS X.â Click the version number to see the build number. 1. If you have Mountain Lion v10.8.5 (build 12F37), you can install OS X v10.8.5 Supplemental Update to get OS X v10.8.5 (build 12F45).