macOS is a series of graphical operating systems developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple’s Mac family of computers.

64-bit and macOS version.

Because I continue to work on my software.

While working on my software, I have to keep my software up to date to the most recent version of macOS. The latest releases of my software tends to focus on OS X El Capitan , macOS Sierra, macOS High Sierra and soon macOS Mojave.