For those that are still interested to know, the RSPdx is supported on all platforms.
The Raspberry Pi image (0.7) can be found here: https://www.sdrplay.com/raspberry-pi-images
The MacOSX requires 2 downloads, one for the API: https://www.sdrplay.com/software/SDRplay_RSP_API-MacOSX-3.07.3.pkg
and one for CubicSDR 0.2.6: https://www.sdrplay.com/software/CubicSDR-0.2.6-Darwin.dmg
We have been going through a period of beta testing for the API 3, so we appreciate everyone’s patience and those that have provided us with feedback.