you have not made the change I suggested in my last reply.
change lines 1-2:
<?php require_once("WA_Universal_Email/mail_php.php"); ?>
<?php require_once("WA_Universal_Email/mailformatting_php.php"); ?>
to use the Universal Email 4 syntax instead of the universal email 3 syntax:
<?php require_once("webassist/email/mail_php.php"); ?>
<?php require_once("webassist/email/mailformatting_php.php"); ?>
also make sure to upload the webassist directory to the server.
If the form is still working after making this change I will start a support ticket.