Key activation instructions:
1. Download (http://steampowered.com/download/SteamInstall.msi) or launch the Steam client.
2. Log in or register a new account on steam.
3. In the lower left corner, click on "+ Add game", and then click on "Activate on Steam" and enter the activation key for the game, which you will receive after payment.
After that, the game will appear in the "Library" section.

Windows:
Minimum:
OS: Windows 7/8/8.1/10 or compatible
Processor: 2.0 GHz
Memory: 2 GB RAM
Graphics: NVIDIA GeForce GT 240 (or better)
Storage: 1 GB available space

MacOS X:
Minimum:
OS: 10.9 or compatible
Processor: 2.5 GHz Intel Core i5
Memory: 2 GB RAM
Graphics: Intel HD Graphics 4000 1024 MB
Storage: 1 GB available space