There is no need for warnconfig. Originally, you would have to edit the group ID number for the "Banned by Warning" group in the warnconfig.php file, but now all you do is updated it under vBulletin Options > Warnings System in the Admin CP
Also, a fix for those of you who have installed it, uninstalled it, and get the "40" error.
In install_warning.php find:
PHP Code:
$DB_site->query("DELETE FROM settinggroup WHERE displayorder=44");
$DB_site->query("DELETE FROM setting WHERE settinggroupid=44");
and replace with:
PHP Code:
$DB_site->query("DELETE FROM settinggroup WHERE displayorder=40");
$DB_site->query("DELETE FROM setting WHERE settinggroupid=40");
Upload to your admin directory and now you can install/uninstall at your whim without worrying about getting the "40" error.