If you download the file when logged in as administrator (or any other user with 'upload_files' capability, the downloads are not count. Also, the disk folder which holds the files and the 'logical' name to download them, cannot be the same. (I think your case is this as the link points directly to the disk file).
I will start rewriting this plugin in next weeks. It was one of the firsts thinks I wrote for WordPress and its maintenance has been abandoned for a while. Looking at it now, I don't like how it does and manages all things. This plugin is needed for better settings, some checks, and a easiest way to manage the whole thing.
Hope I will be able to rewrite it, and provide a 2.0 version as soon as I want to.