The link I provided above works fine, I just tested it. You have to wait 30 seconds before the download button is activated in the download page. Sorry for the tricky file host I'm using, I'm not rich enough to get a true host.
What tutorial are you talking about? a 3dsmax tutorial? my package has the advantage to contain .blend files, which are fully converted cars. Obj file converting with current version of Blender is not possible.