You'll need to download all the files in this repository, and make sure they are all in the same directory. First download the GUI files, GUI_Taylor_Maccoll.m and GUI_Taylor_Maccoll.fig. Next download the following function files (denoted by all caps): THETA_BETA_M_v2.m, TM_EQUATIONS.m, and EVENTS.m.
Now all you need to do is run GUI_Taylor_Maccoll.m.
Coming Soon!
In the meantime, see my YouTube Videos on this topic. I'm hoping to finish this series in the near future.