public PortalItemType PortalItemType {get;}

{
  var packages = new List<PortalItemType>
  {
    PortalItemType.BasemapPackage,
    PortalItemType.GeoprocessingPackage,
    PortalItemType.LayerPackage,
    PortalItemType.LocatorPackage,
    PortalItemType.MapPackage,
    PortalItemType.ProjectPackage,
    PortalItemType.ScenePackage,
    PortalItemType.RulePackage,
    PortalItemType.VectorTilePackage
  };
  var folder = @"E:\Temp\PortalAPITest\";
  //Get the UserContent - refer to the initialization section above for more details
  foreach (var di in userContent.PortalItems.Where(pi => packages.Contains(pi.PortalItemType)))
  {
    var path = System.IO.Path.Combine(folder, di.Name);
    await di.GetItemDataAsync(path);
  }
}