If you get an error, try a little later as servers are getting hit hard.
Login w/ free account to claim. Requires Epic Games Launcher to play. Moonlighter (Reg. $20) & This War of Mine (Reg. $20).
https://www.epicgames.com/store/en-US/collection/free-game-collection
Steam links for info only:
Moonlighter
https://store.steampowered.com/app/606150/Moonlighter/
This War of Mine
https://store.steampowered.com/app/282070/This_War_of_Mine/