Hey guys,
I'm actually using Tasharen Fog of War in my Unity 5 Personal Edition right now. And it works. As far as I remember, I didn't have to modify anything.
Just make sure it's an image effect attached to your main camera, or whatever camera you want.
Just in case anyone's wondering. Aren's fog of war systems is excellent and runs well. But it is a bit complicated to set up at first. And I wish he would provide more support for this product. It's really good, just a bit annoying at times.