Oki,Masterslash try to Verify the engine with the Verify button in your EpicLauncher and if it not help you,than go to the folder with the Engine and get the logs of starting the Editor.
Oki,Masterslash try to Verify the engine with the Verify button in your EpicLauncher and if it not help you,than go to the folder with the Engine and get the logs of starting the Editor.