The listing, Demonicon - Steam Key has ended.
The Dark Eye: Demonicon offers the most intensive role-playing experience so far in the idyllic but dangerous fantasy world Aventuria. In a grim fantasy world, the player controls a hero, armed with the powers of the nether regions. Action-packed battles and quests with multiple decision-making processes lead the player through a story of love, betrayal and demonic temptation.
Played as an action-oriented role-playing game, The Dark Eye: Demonicon aims to impose new standards within the genre with its enormous depth and an epic, movie-like story. The charismatic main character is controlled from a freely zoomable and pivotable isometric perspective, and the authentic fights are based on the current edition of the "TDE" rulebook.
Here is a steam copy for the game "Demonicon" :
http://store.steampowered.com/app/215630/
All you need to do after receiving the key is :
1- Open your steam and sign-in.
2- Go to the games menu in the top of the screen you will find "Activate a steam product".
3- Follow the instructions then enter the key to activate the game.
4- Install the game.
5- Enjoy it.
Please note that if you use the key and activate the game through steam, you can't ask for a refund.