I've added a mac version of the devfiles with this update. I don't think a great deal with have changed since the last update for Windows users, but I've included a Windows update too, to keep everyone in sync.
For any mac users, let me know if you have any issues with the mac version of the devfiles. I've tested them on my macbook and they seem to work but adding support for different operating systems generally results in some unwelcome surprises that aren't always immediately obvious.
Lastly, it looks like for the mac version you may have to navigate to the devfiles's installation directory and open them from there, since the play button doesn't appear to do anything. This isn't unduly surprising to me, since the devfiles don't contain an actual program, but are rather just files that are opened by Unreal. To my surprise, the play button actually opened them automatically with Unreal on Windows, once the file association had been set, but that minor convenience doesn't seem to have made it over to mac.