I am not sure you are aware of the following so let me explain...
Our latest release works on Mac no problem. You do NOT NEED the new SignageController.exe as the basic functionality that worked in 1.5 will still work in the latest release of 1.7.
What you will not get on a Mac right now, are some of the EXTRA features that were added such as Remote Screen Capture, Music Player, PC reboot etc. These enhanced features NEED the SignageController. However, for basic signage to work (same as in 1.5), you can still use it on a Mac including doing a remote Save and restart of the AIRPlayer.
So, no we did not stop supporting Macs and you are free and can still use Macs no problem.
Once we compile the C++ SignageController.exe onto the Mac and Linux platforms, you will begin to enjoy the enhanced features.
Regards,
Sean - MediaSignage.com