I manage to successfully upgrade Umbraco from 4.0.3 to 4.11.10. I have 100's of xslt files in the older version and in umbracoSettings.config file I have used  this settting to be "true". Every thing is working except when I wrote a simple razor macro below and noticed @photo.umbracoFile is always null or empty. I found this article http://allan-laustsen.blogspot.co.uk/2012/04/umbraco-razor-dynamicmedia-umbracofile.html but the solution is a bit confusing. I wonder if any one can help on this?

              
@{
    //Check the currentpage has a value in the property 'photos'
    if (Model.HasValue("sliderImages"))
    {

        var MediaFolder = Library.MediaById(Model.sliderImages);

                <ul>

        @foreach (var photo in MediaFolder.Children)
                    {
                     <li>
                            <img src="@photo.umbracoFile" alt="@photo.Name"  />

                        </li>
                    }
                </ul>

    }
}