Hello @mcmackin,
Let's first try addressing the License issue. At first sight, it looks that the license is not installed in the right location. To check this, let's run the command below into MATLAB's command window.
winopen(fullfile(mbd_find_s12z_root, 'lic'))
This shall open the right location where the license shall be installed. If this is not the right location, please install the license here.

The second thing you might check is that sometimes, the ".dat" extension is not recognized. So if the license is installed at the correct location, please try changing the extension from ".dat" to ".lic" or vice-versa.
Hope this helps,
Marius