Some code got left in catalog/admin/includes/application_top.php that is not needed and will lead to an error. This will not affect you if you don't use the application_top.php that comes with the contribution as it is not in the READ_ME.txt file changes.
This is a full package.

If you don't want to download this and just need the change FIND:
in catalog/admin/includes/application_top.ph

Code:
// set php_self in the local scope
  $PHP_SELF = gfc_base_filename();
//  $PHP_SELF = (isset($_SERVER['PHP_SELF']) ? $_SERVER['PHP_SELF'] : $_SERVER['SCRIPT_NAME']);
REPLACE WITH:
Code:
// set php_self in the local scope
  $PHP_SELF = (isset($_SERVER['PHP_SELF']) ? $_SERVER['PHP_SELF'] : $_SERVER['SCRIPT_NAME']);
More...