I made the mistake of purchasing Metro Exodus from Epic Games. After finishing the game I then compounded the mistake by purchasing the DLC Sam's Story.
The game installed, but remained locked.
I contacted Epic Games to get it unlocked and they insisted that I send them all my personal information, including any social media I am subscribed to.
I then received an email from them informing me that there would be no refund since it has been two weeks since purchase and the game had been played for two hours.
I purchased the game three days ago and it couldn't be played at all because it was locked.
Epic Games is a spyware/scam site.
Avoid it and purchase from reputable gaming sites, such as Steam.