Rhino 5.5 for Mac not working with plugin from Maxwell 4

My office uses the previous versions of Rhino (5) and Maxwell (4) for our rendering outputs. I downloaded the demos for Rhino 6 and Maxwell 5 today to see if it would work with our processes.

Now I need to get some work done on my full license previous versions but Rhino keeps giving me this error when open the program. How can I fix this so I can get back to work? I have deleted and uninstalled the demo programs and still get this error

Sorry, you’ll need to contact the Maxwell developer for help with that.