In order for you to play Post Master on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
Mac Os 10.7
Processor (CPU):
Dual core 2.4 GHz
Memory (RAM):
2 GB RAM
Graphics Card:
Dedicated graphics card with 256 MB memory (GeForce 7600 GT-class equivalent or better)
Storage:
500 MB available space
Sound Card:
DirectX 9 compatible sound