That probably isn't going to work out of the box. I suppose it could be modified to work, but I wouldn't know where to suggest looking as I've not looked at the asset. I think there was another 2d volumetric light system which did work with tk2d sprites, but again, I'm not sure. I think it might be the other one you linked - it seems to use colliders to work out occlusion, so it should work, but I recommend checking with the author of the plugin to be sure.