Hi Will,
Thank you for offering me the certificate. It looks nice.
Concerning the errors you got on the Windows MATLAB side, there are several things you can check first:
1. The latest files from GitHub are dated on 07/23. You are recommended to download the latest files. (The files on 07/21 should work though.)
2. Put all the files from GitHub in the same folder. When you run the models, please make sure that folder is on the path.
3. Besides the files from GitHub, you also need to install the libiio on your PC. The installer for Windows can be found on ADI Wiki page: Simulink libiio [Analog Devices Wiki]
As you said, this Simulink libiio stuff is created in 2013b. Since you are running it in a different version, it may cause the problem, but please take a look at these steps first and let me know how things work.
Best,
Di