Can't intialize more then 45% please help me

I can’t speak english verey well, I am sorry for that, I hope you to get my questions. thanks
Hi
I am new to unreal engine , I was download the unreal source and i was had an error with building process the error is:
connot write the file ue4rule.dll i was fixed it by renaming the fils in build process tow time. (sloved and build successfully).
but the problem is now:
when i open ue4 editor at initializing process when 18%. error come: unrealbuildtools.exe stopped working. when concel it the initializing process go to 45% and no more and not open my ue4 editor.
i hope to get my questions.

Hi Hashash49,

I’m sorry that you are having an issue with the Epic Games Launcher. In order for us to offer the best support, we have recently modified the process for how Epic Games can help troubleshoot your Launcher issue. Please visit http://help.epicgames.com/ for technical support, here you can find information and solutions for common issues, as well as a contact form if you still need additional assistance. Thanks!