Here is the proper home of that script. You got it from a site that re-distributes "free" scripts. (Which may not be as "free" as claimed...)
You need to pay a license fee for support. But you can use the jQuery plugin for free - without support. The Wordpress plugin requires a paid license.
They do include an un-minified script in the download. You should use the un-minified script during development and testing.
There's some documentation and a support area on the site, though. The documentation may help. I'm assuming you need a license to get support.