The Season Pass for Rise of the Tomb Raider includes a range of content that will extend your single-player campaign, and also allow you to compete with friends. Three major releases will challenge you to survive the extreme conditions of Endurance Mode, explore a new tomb that houses an ancient terror in Baba Yaga: The Temple of the Witch, and combat waves of infected predators in Cold Darkness Awakened. In addition, a steady stream of outfits, weapons, and Expedition Cards beginning on Day 1 and continuing over four months will keep you customizing, expanding, and challenging your friends to new adventures.

Go to: http://store.steampowered.com/ and download STEAM client Click "Install Steam" (from the upper right corner) Install and start application, login with your Account name and Password (create one if you don't have). Please follow these instructions to activate a new retail purchase on Steam: Launch Steam and log into your Steam account. Click the Games Menu. Choose Activate a Product on Steam... Follow the onscreen instructions to complete the process. After successful code verification go to the "MY GAMES" tab and start downloading.