LoadGameObject.cs - Load game object từ assetbunle Unity 4

using UnityEngine;
using System.Collections;

public class LoadGameObject : MonoBehaviour {
    public int version;
    AssetBundle bundle;
    public string url = "http://app.baib52.com/test/Cubes.unity3d";
    public string url_android = "http://app.baib52.com/test/Cubes.unity3d.android.unity3d";
    WWW www;
    // Use this for initialization
    void Start () {
        StartCoroutine(LoadData());
    }

    // Update is called once per frame
    void Update () {

    }
    IEnumerator LoadData()
    {

        www = WWW.LoadFromCacheOrDownload(url, version);
        //  www = new WWW(url);
        yield return www;
        Debug.Log(string.Format("Progress - {0}%. from {1}", www.progress * 100, www.url));
        if (Application.platform == RuntimePlatform.Android)
        {
            www = WWW.LoadFromCacheOrDownload(url_android, version);
            //  www = new WWW(url_android);
            yield return www;

        }
        //while (www.progress < 1)
        //{
        //    m_CurrentValue = www.progress * 100;
        //    Debug.Log(string.Format("Progress - {0}%. from {1}", www.progress * 100, www.url));
        //    yield return new WaitForSeconds(.1f);
        //}
        bundle = www.assetBundle;
        GameObject obj = bundle.Load("Cubes", typeof(GameObject)) as GameObject;
        Instantiate(obj);
    }
}