Elite Dangerous and The World Next Door are free for a limited time on the Epic Games Store. These games normally cost 24.99€ and 8.19€ but for the next seven days you can get them for free. The offer ends on Thursday, November 26.
To get the games, just go to the Elite Dangerous and The World Next Door pages on the Epic Games Store, and click the "GET" button. Once you get the games, they will be yours forever.