Darren:
Thanks for the question. The folks at ADI who helped MathWorks develop the model, and are most familiar with it, hang out on the software forums -- not on the transciever forums. That's why it was moved here.
Our docs:
http://wiki.analog.com/resources/eval/user-guides/ad-fmcomms2-ebz/software/simrf
Indicate : MATLAB (R2014a and beyond)
I'm not sure the XML file will load at all on anything before that (not likely 2012) - as it uses a new/recent method for loading hardware support packages, that may not be understood for old versions.
