Take a look in both of these locations and see if any log files are present.
C:\Users[USERNAME]\AppData\Local\EpicGamesLauncher\Saved\Logs
C:\Program Files\Unreal Engine\Launcher\Engine\Programs\NoRedist\UnrealEngineLauncher\Config
Take a look in both of these locations and see if any log files are present.
C:\Users[USERNAME]\AppData\Local\EpicGamesLauncher\Saved\Logs
C:\Program Files\Unreal Engine\Launcher\Engine\Programs\NoRedist\UnrealEngineLauncher\Config