The shadows on the landscape do not work. Maybe there is a lesson or a detailed description?
Make sure your ShadowRT is attached to the trueSKYSequence Actor, and it is updating.
One known issue right now is that Unreal does not respect the Fade distance initially, try changing the value then changing it back so Unreal updates the light. Fade distance is on the Directional Light. Also make sure you are using our Light Function on the directional Light (Should be default).
Alternatively, are the shadows working but just not on the landscape?
Cheers,
James