Extracting Dataset (AR) from OBB (Expansion Files)

Bear with me on this one, its mainly a question about correct coding.

I have an Augmented Reality project that I'm using OBB Expansion Files with. I've got it all working great but the ARCamera doesn't augment anything. I know this requires some coding in order to extract the .XML and .DAT files specified here:

https://developer.vuforia.com/forum/faq/unity-how-can-i-handle-large-android-apps https://developer.vuforia.com/forum/faq/unity-loading-dataset-sd-card https://developer.vuforia.com/forum/android/android-split-issue-unity3d

Based on these 3 links I've come up with this:

First I created a scene with a Main Camera and Empty GameObject in it. On the GameObject I put the following script:

 using UnityEngine;
 using System.Collections;
 using System.IO;
 
 public class ObbExtractor : MonoBehaviour
 {
     private string urlOfDatasetInObb, filePath, directoryPath;
     private IEnumerator loadARComponentsForAPKSplit()
     {
         //if UNITY_ANDROID
         urlOfDatasetInObb = System.String.Empty;
         filePath = directoryPath = System.String.Empty;
         directoryPath = (Application.persistentDataPath + "/QCAR");
         Directory.CreateDirectory (directoryPath);
         yield return null;
         
         urlOfDatasetInObb = (Application.streamingAssetsPath + "/QCAR/TrackerName.xml"); 
         var www = new WWW(urlOfDatasetInObb); 
         yield return www;
         filePath = Path.Combine(directoryPath, "TrackerName.xml");
         File.WriteAllBytes(filePath, www.bytes);
         yield return null;
         
         urlOfDatasetInObb = filePath = System.String.Empty;
         www = null;
         
         urlOfDatasetInObb = (Application.streamingAssetsPath + "/QCAR/TrackerName.dat");
         www = new WWW(urlOfDatasetInObb); 
         yield return www;
         filePath = Path.Combine(directoryPath, "TrackerName.dat");
         File.WriteAllBytes(filePath, www.bytes );
 
         Application.LoadLevel("ARScene");
     }           
     // Can load the level now!
     //endif
     }

Then I created a basic AR scene; tracker and basic model. On the ARCamera, I put the following script:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class Extract : MonoBehaviour {
     
     private bool mDataSetsLoaded = false;
     private string[] mDataSetNames = new string[] {"TrackerName.xml", "TrackerName.dat"}; //replace with your dataset name
     // Update is called once per frame
     void Update () 
     {
         ImageTracker itracker = TrackerManager.Instance.GetTracker<ImageTracker>(); 
         if (itracker == null) return;
         if (!mDataSetsLoaded) {
             string dataSetRootDir = Application.persistentDataPath + "/QCAR/";
             foreach(var datasetName in mDataSetNames) {
                 DataSet dataSet = itracker.CreateDataSet();
                 if (dataSet.Load (dataSetRootDir + datasetName, QCARUnity.StorageType.STORAGE_ABSOLUTE))
                     itracker.ActivateDataSet(dataSet);
             }
             mDataSetsLoaded = true;
         }
     }
 }

I then made sure the Dataset is selected and activated, the Write Access is set to External(SDCard) and Split Binary is checked. Whether I test it in Play Mode, or Build and Run it onto my Samsung Galaxy Tab, nothing happens.

Does anyone have a clue what I'm missing?

Thanks in advance