This version of EQMac is a small update that is designed to integrate natively with PHD Guiding. Previously it has been necessary to select Equinox 6 as the mount type in PHD in order for pulse guiding to work. This could cause problems for users that wish to run Equinox alongside EQMac so I contacted the author of PHD who has kindly made a pre-release version of PHD available that will support EQMac directly.
You can download the pre-release version of PHD here: http://www.stark-labs.com/depot/beta/PHD_OSX_1_13_3.zip
With the pre-release version of PHD, you'll find a new mount type called EQMac in the Mount menu. You should select this when you want to connect with EQMac for pulse guiding.