UE4 source not compiling?

Hi UE4 team,

I am using the launcher version of ue4 , whenever I am building the UE4 module from my project the build gets finished in just blink of an eye.

I tried by adding codes to UE4 source still the same result.

Do I need to get github version of UE4 to be able to build or rebuild the UE4 source module.