Civilization 5 Brave New World is the DLC. To activate you need to have Civilization 5 on your Steam account. Civilization 5 Brave New World is delivered as Steam cd key after your purchase. Civilization 5 activation and installation are all over Steam. Internet connection is required. Be a ruler of the world by establishing and leading a civilization in the age of space in the space age: Charge the war, do diplomacy, discover new technologies, start with some of the greatest leaders of history and establish the most powerful empire.