Either the software is misconfigured or the files weren't uploaded properly. The error is a standard 404 error, and a quick scan of your folder shows any of the html files linked to simply aren't there - all there is in the directory is an index.php only, with a bunch of subfolders.
Other than that, it's not an issue with the hosting account. Just that somethings missing or not configured properly with the software you're trying to use.