Hi , thats odd, as the FluidSurfaceEngine is a seperate module in the same . Can you check your Plugins//Binaries/Win64 directory and make sure a FluidSurfaceEngine dll was created.
Well yes, it would be a mix of precalculated and dynamic clamping. What I really mean to say is it would not be an input provided by the user. Terrain intersection would be precalculated, same with static objects. Where as dynamically moving objects would dynamically update the clamp map. Something along those lines.
UPDATE: As of right now the will not compile in 4.2 preview. I am aware, I have already updated the code here locally to work. (Just need to bring PNTessellation and FlatTessellation in line with the latest release). Will most likely update sometime weekend.