Cannot get module to work

I've spent the whole day trying to get this module to work. At present, all I get when I run it is an empty white pop-up box with an OK button; including if this is the only check requested in Content Analysis.

There are conflicting instructions for installation and multiple sources of the underlying library files. It would be great if someone with the necessary skills checked the current installation instructions and:

* Correctly identified the latest verified source of the necessary files (that match each other)
* Documented precisely where the files are meant to be placed on the server

I created a /sites/all/libraries/php-text-statistics folder, and in it placed TextStatistics.php, plus the .svn, branches, resources, tags, trunk and wiki folders. I am not sure if this is correct, and if it is, why I only get a blank white pop-up box. I tried moving this content to /sites/all/modules/readability too, but without success (same error).