ah clearly i didnt put enough research in before attempting this 
I am using the standard version of Unreal.
I found these links, i guess its the source version you are talking about?
https://docs.unrealengine.com/latest/INT/GettingStarted/DownloadingUnrealEngine/index.html
https://docs.unrealengine.com/latest/INT/Programming/Development/BuildingUnrealEngine/
I will get back to this post and let you know how it goes.