If your Mac is from early 2009 or earlier, you're out of luck. The first thing to do as you prepare for MacOS High Sierra is to check if your Mac is compatible not all Macs will be able to make the leap. Learn if your Mac is compatible with MacOS High Sierra and, if so, how to prepare it before downloading and installing the update.
As with past OS X and MacOS releases, MacOS High Sierra is a free update and available via the Mac App Store.
Apple's next Mac operating system, MacOS High Sierra, is here.
