https://www.bleepingcomputer.com/news/gaming/epic-games-now-requires-epic-online-services-how-to-install/

Epic Games now requires users to install Epic Online Services to properly use the Launcher. Here's how to fix the blank screen that is preventing users from installing this new service.

When users launch the Epic Games Launcher, they are greeted with a message stating, "Epic Online Services installation is required - you will not receive any Launcher updates until Epic Online Services is installed. Please see the settings menu."