I've downloaded Motion 5 to start to check it out on a secondary system. It has become the default version of Motion and if I want to open a previous version project and keep it in Motion 4, I have to manually open Motion 4. Is there a way of making Motion 4 once again the default version?
BTW, I want to especially thank everyone for their responses and insights regarding this unfortunate X situation. I will ultimately need to make some hard decisions in the next few months, and the cumulative wisdom found here will help to make an informed decision.