How can I set an Image (PNG) from a URL to be the material of a sphere ??

Hi, Im trying to set an image that I'll download from a URL in order to use it as a texture for the material of a sphere.

Untill know, I haved been able to script it to downloaded and saved it into a Image variable, never the less I do not know how to use it into a texture so that then I can assignit to a Material and finally place it into my sphere ??

All of this I aiming to do it at run time by scrip. Any guess ???

 IEnumerator place_ad_material(string ad_id, string add_template)
     {
         WWW wwwAd_Image = new WWW(DBManager.content_Path + "/" + DBManager.EventAuthorID + "/images/" + DBManager.ShowIMGURL);
         yield return wwwAd_Image;
 
         if (wwwAd_Image.texture != null)
         {
             vr_ad_image.sprite = Sprite.Create(wwwAd_Image.texture, new Rect(0, 0, wwwAd_Image.texture.width, wwwAd_Image.texture.height), new Vector2(0, 0));
         
            
 
         }else
         {
             Debug.LogError("Error while Getting Ad ( " + ad_id + " ) Image" + wwwAd_Image.error);
         }
 
     }