Like for example I want a certain map that will not be packed with the game, but will have a separate patch file so the user can install it only if he wants to.
Yes you can. Check Here
Personally I don’t know of any other method. If someone else knows, please inform
We now have release and patching documentation:
- Releasing Your Project | Unreal Engine Documentation
- http://docs.unrealengine.com/latest/INT/Engine/Deployment/Patching/
Cheers