Windows installer:

Mediafire:
http://www.mediafire.com/download/ce6pzwwtp5tbuev

MEGA:
https://mega.nz/#!DdkEVKJb!yOwskSZdTofta9H1RZ7QXC3WmXQdW4W5r4RlYwSE4HA

Torrent:
http://goo.gl/QU2gR8

Linux and Mac installer (PlayOnLinux/PlayOnMac and Wine required):

Mediafire (Linux/Mac):
http://www.mediafire.com/download/iq13t2g526tt7hq

Mega (Linux/Mac):
https://mega.nz/#!TUED3Lia!S9JwPgYiznc4Ai_Nbww7rHvYo1zBWt_ge7yKczx1TQk

Torrent (Linux/Mac):
http://goo.gl/RPwaHT

How to install the game on Windows:

Download the installer from the link above for Windows. Lanuch it and install the game wherever you want on your PC. The game comes with the launcher file which should be on your desktop after successful installation. Launch the launcher and choose one options in order to play Single player or Multiplayer mode.

The game runs fine on Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1 and Windows 10.

How to install the game on Linux/Mac:

Download the installer from the link above for Linux or Mac. Now, in order to install the game you require either PlayOnLinux (if you use Linux) or PlayOnMac (if you use Mac). Once the game is installed, you require another software which is named Wine in order to launch the game.