The Armored Transport DLC is the second DLC pack for PAYDAY 2 and lets players do every heisters dream – robbing armored transports, full of valuables, right in the middle of Washington D.C. If they're lucky, they can hit it big with a classic train robbery.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.