Another option to find out what version you are using assuming you're not hitting the web page is to look in the install directory for a folder called "install". In this directory, there is a file called "patchlvl.txt". This file is in all the Arbortext installs and contains the current installed version. It will look something like this:
Version 11.3 M010
February 3, 2007
Version 5.3 M010
Hope this helps...
Bob