Using Unity's atmospheric scattering

I have found an atmospheric scattering for free on the asset store made by Unity that was used in the Blacksmith short they made. Problem is, I can't get it to work. In my scene I dropped the "Atmo Scattering Deferred" to my camera and set up a light where my sun would be, but nothing happens. It worths mentioning that I have no skybox and my game is 2d using mesh planes and sprites. As a result I wish to use my old mats (though I tried using the mats provided by Unity and it didn't work out). I would like to ask for some help to set up this atmo scattering. Thanks in advance.