I responded to you within a day. Your post -- April 18. My response - April 19. Not sure where the 3 day figure is from.
I explained to you that FOWRenderers hides objects that are not visible by the fog of war by disabling them. It's an optional script meant to improve performance by disabling invisible objects.
FOW Image Effect is what actually draws the fog of war. Since you are using Unity Free however, this won't work for you. Only the custom material shader approach will work (second example). For this to work, the objects themselves need to have the appropriate fog-sampling code inside. The package provides two examples of such shaders -- one for the objects (diffuse) and another for the terrain.
If you need better help, provide more details. The more details you provide, the better I can help. And post some pics of the issue. That always helps.