UDK is bad at this. What type of dynamic lighting you want?I mean you want sunlight?Or just dynamically changing shadows for a not moving lamp? Dynamic lighting is just really needed when you have moving light source or a lot of movable meshes.Its easy to set up by the way.You place your light source or light sources, hit f4 and you change the lighting channel to only dynamic, and check cast dynamic shadows.You need to do this with your meshes too.Then you need to turn off "use global illumination", and to turn on "force no precomputed lighting" in the world properties/lightmass. You will get black shadows because then you are not using global illumination.But, if you place a skylight actor, you can brighten up this.
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