Download Unity Scene Using Asset Bundle and Show Progress Bar

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System;
using System.IO;
using UnityEngine.SceneManagement;

public class AssetBundleSceneLoader : MonoBehaviour 
{
	public string url;
	public int downloaded = 0;
	AssetBundle bundle;
	public System.Object test;
	public Slider progressbar;

	public float progress;

	WWW www;
	void Update() {
		progress = www.progress;
		progressbar.value = progress;
	}

	IEnumerator Start() {
		ClearCacheExample ();
		if (downloaded == 0){
			using ( www = WWW.LoadFromCacheOrDownload (url, 0)) {
				yield return www;
				if (www.error != null)
					throw new Exception ("WWW download had an error:" + www.error);
				if (www.error == null) {
					bundle = www.assetBundle;
				}
			}
			if (Caching.ready == true) {
				downloaded = 1;
				string[] scenePath = bundle.GetAllScenePaths();
				Debug.Log(scenePath[0]);
				SceneManager.LoadScene(scenePath[0]);
			}
		}
	}

	void ClearCacheExample()
	{
		Directory.CreateDirectory("Cache1");
		Directory.CreateDirectory("Cache2");
		Directory.CreateDirectory("Cache3");

		Caching.AddCache("Cache1"); 
		Caching.AddCache("Cache2"); 
		Caching.AddCache("Cache3"); 

		bool success = Caching.ClearCache();

		if (!success)
		{
			Debug.Log("Unable to clear cache");
		}
	}
}

#if UNITY_EDITOR
using UnityEditor;
using System.IO;

public class AssetBundels
{
	[MenuItem("Assets/Build AssetBundles")]
	static void BuildAllAssetBundles()
	{
		string assetBundleDirectory = "Assets/AssetBundles";
		if(!Directory.Exists(assetBundleDirectory))
		{
			Directory.CreateDirectory(assetBundleDirectory);
		}
		BuildPipeline.BuildAssetBundles(assetBundleDirectory, BuildAssetBundleOptions.StrictMode, BuildTarget.iOS);
	}
}
#endif