In order for you to play The Stanley Parable on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
Mac OS X 10.8 or higher requiredProcessor (CPU):
3.0 GHz P4, Dual Core 2.0 (or higher) or AMD64X2 (or higher)
Memory (RAM):
2 GB RAM
Graphics Card:
ATI Radeon 2400 or higher / NVIDIA 8600M or higher