If you are getting a line in your error_logs about a modification file, then you haven't completely uninstalled it correctly. You need to go through the install instructions completely backwards. And sometimes the modification may have special uninstall instructions, so you should check the modification thread.
That login information didn't work for me. But, I went to the thread you linked to -
http://www.esigforum.com/forum/showt...7845-SquallBox - and I had no problem opening any of the attachment links in that thread.