Hi all! I have this problem for 2 weeks. I tried all the possibilities, I uninstalled the application, I installed it again, I added the famous lines in the direct access to the end of line “-http=wininet”, I also tried it with the other line “-OpenGL”. Other options that I tried are to grant Administrator’s permissions to direct access, compatibility to Windows 8, 7 and XP (already desperately and without reasoning). I also contacted Microsoft and started a live chat where they took control of my PC and reviewed everything. In conclusion according to Microsoft the problem is incompatibility of the application and should wait for its update.
One more thing, the problem came after updating to the latest version of Windows 10 1809.
Honestly I do not know what else to try, I do not use unreal to play, I use it for 3D works.