There’s a page in the docs about samples with no way to actually download them. I’ve searched in the marketplace but there’s nothing there.
For example: https://docs.unrealengine.com/latest/INT/Resources/Showcases/RealisticRendering/index.html
If you open your Epic Games Launcher on the Unreal Engine Tab go to Library and scroll down there should be already some templates. I think the realistic rendering template should also be there.
Good Luck