How to load a scene from AssetBundles from the web using 5.2 AssetBundle system showing download progress?

Currently I am using this example: http://unity3d.com/learn/tutorials/topics/scripting/assetbundles-and-assetbundle-manager?playlist=17117 which I have downloaded from AssetStore for scenes loading from AssetBundles. But it lacks the download progress. So my question is how to add download progress to that or write completely new script for dowloading the scene including the download progress.