WWW Class does not work on IOS (But it works in the editor)

I'm trying to download an Asset Bundle through a link online, in the Unity Editor it works perfectly, it'll download the bundle and put it into the scene, although when I build the project and put it onto my iPhone, it'll download the model but it doesn't instantiate it.

 IEnumerator down() {
         
         print ("Start Download");
 
         //Download from URL
         var www = WWW.LoadFromCacheOrDownload(BundleURL,4);
 
         //While the bundle is downloading...
         while (!www.isDone) {
 
             //Show percentage of download complete
             tex = ((Mathf.Round(www.progress*100)).ToString())+"%";
             if(tex == "0%") {
                 tex = "Loading...";
             }
             text.GetComponent<Text>().text = tex;
             text2.GetComponent<Text>().text = tex;
             text3.GetComponent<Text>().text = tex;
             text4.GetComponent<Text>().text = tex;
             text5.GetComponent<Text>().text = tex;
             yield return 0;
         }
 
         //If Download failed, produce error
             if (www.error != null)
                 throw new Exception ("WWW download had an error:" + www.error);
         
         //Else if download successful, Instantiate it.
             AssetBundle bundle = www.assetBundle;
             if (AssetName == "")
                 tank = Instantiate (bundle.mainAsset) as GameObject;
             else
                 tank = Instantiate (bundle.LoadAsset (AssetName)) as GameObject;
 
             bundle.Unload(false);
 
         //Interact with other GameObjects and tank's transform.
             newobj.GetComponent<ContentManager> ().AugmentationObject = tank;
         tank.transform.parent = obj.transform;
         tank.transform.localScale = new Vector3 (1, 1, 1);
 
             print ("Finished!!");
 
         //Run TextFinished Code
         StartCoroutine(    TextFinished ());
     }

This is the code I'm using, on mobile the download percentage will hit 100% and nothing else will happen. Then if I try to download it a second time it'll be stuck on 0% almost like it's trying to grab it from the cache.

For extra information, I'm using Vuforia's Cloud Recognition to download an asset based on the image it's viewing.