Current version seems to be v1.6.0. I can find a Windows build of 1.6.0 at EmuCR (be wary) and a few older Windows builds linked to from MAMEWorld and Emu-France. However, it seems no one is making and distributing Mac builds.
You can try QMC2. Ive been using it since M+Gui went dead years ago.. The Mac maintainer does make Universal builds too so you should be ok, Ive never tested them though, just the Intel ones.