How can i stop UE4.12 from crashing at 45%

Hi,

My installation of Unreal Engine 4,12,5 is crashing every time i try to open it from the launcher.

It was working great until i tried to import a few files in my project and my editor crashed. Now i cannot start it.

I deleted all of my repositories, so i now have no UE4 projects on my computer.

I uninstalled the software from the launcher and then tried reinstalling it, but i still have the same crash.

is there any other local preferences or related files that do not get uninstalled and could be causing the crash?

I am a student, and up until now have spent a lot of time with unity so i am quite new to debugging this kind of issue.

I am running UE4 in windows 8.1 through bootcamp on an early 2015 MacBook Pro.

UE4 4.11 seems to be working fine, but my project is setup in 4.12.

I also tried deleting all of the data inside DerivedDataCache. (both 4.12 & common).

Any help would be greatly appreciated.

Thanks!

I deleted all of the DerivedDataCache info again and it worked.