In order for you to play Catan Universe on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
OS X Mavericks 10.9
Processor (CPU):
1.5 Ghz Dual-Core
Memory (RAM):
4 GB RAM
Graphics Card:
nVidia 320M or higher, Radeon HD 2400or higher
Network:
Broadband Internet connection
Storage:
2 GB available space