There are 4 files to choose from.

The "Attached Thumbnails" are the actual tutorial documents. One is the regular version, the other is the Action Companion, which I recommend only getting after you've done the regular version.

The "Attached Files" are the Action files for Photoshop. Is this what you downloaded? If you open one of those, and open the .atn file inside, it will open Photoshop and add some Actions to your Actions panel.

I hope this helps!