Remedy has announced that Alan Wake will be removed from digital stores on May 15th due to some music license issues. As such, and while the team is looking into relicensing the music for Alan Wake, Remedy offers the entire Alan Wake franchise (including Alan Wake, all DLC, Alan Wake’s American Nightmare) with a 90% discount.
— Remedy Entertainment (@remedygames) May 12, 2017
Even though the original Alan Wake will be removed from digital stores, Alan Wake’s American Nightmare will remain in stores as Remedy negotiated the music licensing for it.
Do note that those who already own Alan Wake will be able to download and play the game, even when the game is removed from digital stores like Steam.