so i bought the game and i have my steam key but when i try to activate the game "please activate the original game. the product code you've entered requires ownership of another product before activation. if you are trying to activate an expansion pack or downloadable content, please first activate the original game, then activate this additional content."

Hey, it's on your account page waiting for you to enable it - https://us.gamesplanet.com/account

Dying Light 2 keys are not available (and will be provided nearer release) but you can get Dying Light right away while you wait.