This is NOT a module, but a stand-alone script which has to be edited (at least you should put your own email address into it!) and copied into the root of your WBCE CMS installation.
Then you can (should) create a cronjob to call the script from time to time. If anything in the file system has changed, you will get an alert by mail.

Please read the documentation on the module's homepage for detailled instructions!