Async await and WWW / AsyncOperation progress

I'm trying to convert coroutines to Tasks using:

https://assetstore.unity.com/packages/tools/async-await-support-101056

It's on Github too:

https://github.com/svermeulen/Unity3dAsyncAwaitUtil

This asset doesn't provide progress report with IProgress<T> interface.

I'm trying to do it but I don't know how.

Any of you has already attempted to do this?

Thanks.

 

The code below works on 2018.2.0f2 as a sample:

Code (CSharp):

1.  
2. public class NewBehaviourScript : MonoBehaviour
3. {
4.  
5.     public Slider Slider;
6.     private WWW www;
7.  
8.     private void Update () {
9.         if (www != null) {
10.             Slider.value = www.progress;
11.         }
12.     }
13.  
14.     public void OnClick() {
15.         SampleWWWAsync("https://speed.hetzner.de/100MB.bin");
16.     }
17.  
18.     private async void SampleWWWAsync(string url) {
19.         Debug.Log("Begin");
20.         www = new WWW(url);
21.         await www;
22.         Debug.Log("End");
23.         www.Dispose();
24.         www = null;
25.     }
26. }

So, I don't know should I dispose both of www and await www. It would be useful if someone explain something about it.