After payment, you will immediately get a link to activate the game on Steam.

Warning: game can be activated only in one of the following countries: Russian Federation, Armenia, Azerbaijan, Belarus, Georgia, Kyrgyzstan, Kazakhstan, Republic of Moldova, Tajikistan, Turkmenistan, Ukraine and Uzbekistan.

http://store.steampowered.com/app/207620/

Title: The Walking Dead: 400 Days
Genre: Adventure
Publisher: Telltale Games
Release Date: 3 Jul, 2013

Description:

* WARNING! This full DLC for the game The Walking Dead. To activate it, you must have this game on your account Steam.

Centered on a truck stop on a Georgia highway, this DLC episode for Season 1 of The Walking Dead by Telltale Games tells five linked stories of survival in the wake of the zombie apocalypse. From day 1 of the undead plague to 400 days later, The Walking Dead: 400 Days offers more of the horror and human drama of Robert Kirkman and Telltale’s award-winning series. Echoes of the choices you made in Season 1 will carry over into '400 Days' and the choices you make in '400 Days' will resonate into Season 2.
Key Features

DLC for the winner of over 90 Game of the Year Awards
5 linked stories that can be played in any order
See the apocalypse develop from 5 very different points of view
Your decisions will affect the story around you

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Instructions on how to activate the game:

1. Install the client Steam http://store.steampowered.com/about/ (if not already installed);
2. Log in to your Steam account or create a new one;
3. Click on the link received after payment. This will cause the activation of the game and you can add it to your library, or put in your inventory to send to a friend;
4. After activating the game appears in the library and you are ready to install it!