The Messenger and DLC on Epic Games

Login or create an account, add the game to the cart and checkout. The other way you can take the game is through Epic Launcher, just open it, go to the store find the game and checkout.

DLC is also free, once you claim the game, go to the page again and go down add the dlc to cart and checkout

https://www.epicgames.com/store/en-US/product/the-messenger/home