LymeStack is currently only officially supported on Windows, but we're working on changing that. We've already gotten a prototype up and running on our end that runs independently apart from any part of Windows, but the installation experience is not currently quite as guided and refined as the Windows experience.
If you're interested in getting up and running with LymeStack with what's already out there, we recommend you download and install VirtualBox (free) or Parallels Desktop (subscription) in order to run Windows on your Mac.
If you're interested in getting LymeStack up and running natively on your Mac or Linux machine, contact us, and we can help you through it. We don't have a lot of customers just yet, so we have the bandwidth to offer some personalized help. This will hopefully change in the future!