I was trying to install fortnite and the epic games launcher after it had stopped working on me. I tried to reinstall but as soon as I try to open the launcher it just stops responding on a black screen with a full blue loading bar at the bottom. it did work initially but when I tried to install Fortnite it crashed showing an error with the Unreal Engine.
If you dial the resolution of your whole computer back, the launcher works. I set mine to 1600 by 900 to download some games before setting it back to max resolution and just clicking on the new games shortcuts on my desktop, since that still works