Although an additional step, you can also start from the NACS software licenses page...
http://licenses.nacs.uci.edu/detail2.cfm?ProductID=83Midway down the page there is a link to "Please log in..." which requires UCInetID login. After logging in, you will be given the licensing information you will need to enter when you register the product as a member of the UCI community.
It will also have a link to the NACS mac archive
http://mac.nacs.uci.edu/ for the actual download.
--ST