How to get the downloadable content:
Register on Steam or log in with already existing account and enter on Dying Light – Volatile Hunter Bundle store page. Click on Add to Account button to keep this DLC permanently. You need to own Dying Light in order to get this DLC. This offer will expire Apr 7 at 17:00 UTC.
Or just click on following link: https://store.steampowered.com/app/436082/Dying_Light__Volatile_Hunter_Bundle/
About this content
Spread terror among hordes of night zombies! Don your fluorescent outfit, equip special weapons, and get behind the wheel of the Volatile Hunter. Prove you were born in the dark, molded by it. The Volatile Hunter Bundle includes: a new buggy paint job, a new character outfit, blueprints for a new sword, baton, maul, and knife. Note: This content requires Dying Light: The Following expansion pack.
Dying Light is a first-person, action survival game set in a vast open world. Roam a city devastated by a mysterious epidemic, scavenging for supplies and crafting weapons to help defeat the hordes of flesh-hungry enemies the plague has created. At night, beware the Infected as they grow in strength and even more lethal nocturnal predators leave their nests to feed on their prey.