Unreal Editors not launching - 9% Initializing

Go ahead and repeat same process (i.e. running editor using command line and -FORCELOGFLUSH command), and grab logs located in this file path (assuming you’re using 4.10. If not, just replace 4.10 with whatever version you’re using): C:\Users\YourUsernameHere\AppData\Local\UnrealEngine\4.10\Saved\Logs