Aytac, I tried again and the download worked fine and the cleaning models did have different formats. However if you are going to supply compatible formats you will need to test them as the models in these formats needed various fixes. You can download free model viewers, Autodesk FBX Review or Clockstone FBX Viewer. Both allow you to view a variety of formats including fbx, obj and 3ds. This will allow you to test the other formats otherwise you could have some unhappy customers especially if they are paid models.