OS: Windows 7/8/10
Processor: Intel Pentium Dual CPU E2180 2.00GHz
Memory: 2 GB RAM
Graphics: GeForce 600M / ATI Radeon HD 5450 (1GB)
DirectX: Version 9.0c
Storage: 2 GB available space
Mac
OS: MacOSX 10.10 or higher
Processor: Intel Core i5 – 2.4 GHz
Memory: 2 GB RAM
Graphics: 1 Gb
Storage: 2 GB available space
Linux
OS: Ubuntu 12.04 LTS or more
Processor: 1.7 GHz Dual Core
Memory: 2 GB RAM
Graphics: 1 Gb
Storage: 2 GB available space
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.