Load Asset Bundle in Editor

I have actually accomplished t$$anonymous$$s with my own script. You have the wrong idea here, you cannot use StartCoroutine except during runtime. My script is designed to not freeze up the editor w$$anonymous$$le running. Use t$$anonymous$$s instead:

 public class DecryptAssetBundle : EditorWindow {
 
 private string assetURL = "";
 private static WWW request;
 
 private static bool run = false;
 private static IEnumerator en = null;
 
 [MenuItem("Bundles/Decrypt Asset Bundle")]
 static void Init () {    
     DecryptAssetBundle window = EditorWindow.GetWindow(typeof(DecryptAssetBundle)) as DecryptAssetBundle;
     window.position = new Rect(Screen.width/2,Screen.height/2, 400,150);
 }
 void OnGUI()
 {
     assetURL = EditorGUILayout.TextField("Asset bundle URL: ", assetURL);
 
     GUILayout.BeginHorizontal();
     if(GUILayout.Button("Clear"))
     {
         assetURL = "";
     }
     if(GUILayout.Button("Decrypt"))
     {
         run=true;
     }
     if(GUILayout.Button("Abort"))
     {
         run=false;
     }
     GUILayout.EndHorizontal();
 }
 
 public void Update() {
     if (!run) {
         if (en != null)
             en = null;
         return;
     }
     if (en == null) {
         en = LoadAsset(assetUrl);
     }
     if (! en.MoveNext())
         run=false;
 }
 
 private IEnumerator LoadAsset(string s)
 {
     Debug.Log("Loading " + s + " ...");
     request = new WWW(s);
     w$$anonymous$$le (! request.isDone)
         // avoid freezing the editor:
         yield return ""; // just wait.
     // I don't like the following line because it will freeze up 
     // your editor.  So I commented it out.  
     // yield return request;
     if(request.error != null)
         Debug.LogError(request.error);
     GameObject g = (GameObject) request.assetBundle.mainAsset as GameObject;
     Instantiate(g);
 }
 
 }