Bundle not founded (404)

Hi, i'm new in assets bundles, i have a 404 error downloading my bundle and i dont know why.

I use this Unity tool for create my bundle (a prefab with a 3D file and relative materials), and it come out in 4 different files:

• bunle
  
• bundle.manifest
• StandaloneWindows
• StandaloneWindows.manifest

I load it all on my website, but when i try to download the bundle i have an error (404 Not Found)
Bundle Link: http://www.maxromagnoli.com/Games/ArtMapp/Bundle

Script to download the bundle:

Code (CSharp):

1. using System;
2. using UnityEngine;
3. using System.Collections;
4.  
5. public class CachingLoadExample : MonoBehaviour
6. {
7.     public string bundleURL;
8.     public string assetName;
9.     public int version;
10.  
11.     void Start()
12.     {
13.         StartCoroutine(DownloadAndCache());
14.     }
15.  
16.     IEnumerator DownloadAndCache()
17.     {
18.         // Wait for the Caching system to be ready
19.         while (!Caching.ready)
20.             yield return null;
21.  
22.         // Load the AssetBundle file from Cache if it exists with the same version or download and store it in the cache
23.         using (WWW www = WWW.LoadFromCacheOrDownload(bundleURL, version))
24.         {
25.             yield return www;
26.             if (www.error != null)
27.                 throw new Exception("WWW download had an error: " + www.error);
28.             AssetBundle bundle = www.assetBundle;
29.             if (assetName == "")
30.                 Instantiate(bundle.mainAsset);
31.             else
32.                 Instantiate(bundle.LoadAsset(assetName));
33.             // Unload the AssetBundles compressed contents to conserve memory
34.             bundle.Unload(false);
35.  
36.         } // memory is freed from the web stream (www.Dispose() gets called implicitly)
37.     }
38. }

Anyone can tell me what i'm doing wrong? Thanks

 

The bundle url is correct, the version is 1 (the one to be downloaded)

 

There is a bundle, what do you expect, a website page?

 

I know, i change the link and use this:
http://www.maxromagnoli.com/Games/ArtMapp/StandaloneWindows/
and the error this time is: 403.14 Forbidden

 

I think maybe is a server issue, i go to Aruba for change some access parameters on my website, if it work we well see in a moment

 

If i upload the bundle in a zip file, Unity can read it as well?

 

I know, but the output is always 4 files

 

And i have another problem: if the file has no extension, the server don't give me the authorization to download it, so i need the bundle is .rar or .zip

 

How could i know?

 

I think, maybe i need some .htacces file?