WWW.assetBundle

Description

Streams an AssetBundle that can contain any kind of asset from the project folder.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    IEnumerator Start()
    {
        using (WWW www = new WWW("https://myserver/myBundle.unity3d"))
        {
            yield return www;

            // Get the designated main asset and instantiate it.
            Instantiate(www.assetBundle.mainAsset);
        }
    }
}

Additional resources: AssetBundle class.