Hi Ryan,
The 2012 Mathscript RT download page can be found here, but the older version will only be available online with SSP (we only make downloads for current versions and evaluation versions of our software generally available to encourage everyone to use the latest-and-greatest software). The Mathscript RT Module for Mac is a free download, but it looks like it still follows this paradigm.
You may be able to register your serial number to gain access to the download. If not, you can call one of our account representatives at (866) 463-3364 and request a copy of the older software. You can also upgrade to LabVIEW 2013 if you have SSP through a service contract, site license, etc.
Regards,
Zach P.
Staff Software Engineer | LabVIEW R&D | National Instruments
