NBA 2K13 was a monstrous release for the world's #1 NBA video game franchise, with more than 38 Sports Game of the Year and "Best Of" mentions. NBA 2K14 will raise the bar yet again, providing the best basketball gaming experience for legions of sports fans and gamers around the world.

You are activating the key and then downloading files from online gaming platforms like Steam. This game is not connected to any other gaming platform, so in order to activate it, you have to download game files first and then use the key in game itself.

Click on the link provided with the code to download the game.
Download all the setup files into the same folder.
Install the game and activate it with your code.