I could not start MakeMKV because it was too old and asked me to upgrade. I downloaded 1.6 and upgraded but it still has the same issue. When 1.6 starts it briefly flashes a version 1.5.8?
Edit:
Sorry, ignore this post. I installed 1.6 when unknown to me I had an error dialog open from 1.5.8. The install said it went fine, but it did not. I still had 1.5.8 on my system.