At this time, PSIM does not currently support Mac. We do plan to develop a new GUI (graphic user interface) which will run in multiple platforms (such as Mac OS). But we have not started the development yet, and this is maybe more than 1 year or so away at least (2022-2023).
However, you may wish to explore this link which is about virtual machines: http://www.vmware.com/ca/products/fusion.html
This enables a user to use Windows on their Mac machine. It is recommended to look into the specifications needed for your particular Mac. Some users have successfully run PSIM on their Mac using VMWare.
Note: When using VM, it gives the option to allocate memory. It is important to allocate enough memory to PSIM or else the performance is sub-optimal.