Nvidia® GeForce™ GTX 560 Ti or AMD® ATI Radeon™ HD 5870 (1 GB VRAM)
DirectX
Version 11
Network
Broadband Internet connection
Sound Card
DirectX 9 sound device
Additional Notes
Multiplayer is compatible between Windows, Mac and Linux versions.
Mac
Requires a 64-bit processor and operating system
OS
macOS High Sierra 10.13.3
Processor
Intel® Core™ i5-4670
Memory
8 MB RAM
Graphics
Nvidia® GeForce™ GTX 775M (2 GB VRAM)
Network
Broadband Internet connection
Additional Notes
Multiplayer is compatible between Windows, Mac and Linux versions.
Linux
Requires a 64-bit processor and operating system
OS
64-bit Ubuntu 18.04 LTS and higher or SteamOS
Processor
Intel® Core™ i3-3240 CPU
Memory
8 MB RAM
Graphics
Nvidia® GeForce™ GTX 560
Network
Broadband Internet connection
Additional Notes
Multiplayer is compatible between Windows, Mac and Linux versions.
Activation details
Go to: http://store.steampowered.com/ and download STEAM client
Click "Install Steam" (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don't have).
Please follow these instructions to activate a new retail purchase on Steam:
Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam...
Follow the onscreen instructions to complete the process.
After successful code verification go to the "MY GAMES" tab and start downloading.