www.makemkv.com

Same here, except before the fatal error message, I get a dialog:

MakeMKV BETA popup:
This application version is too old. Please download the latest version at http://www.makemkv.com/ or enter a registration key to continue using the current version.

I also purchased a registration key in ...

Same here, except before the fatal error message, I get a dialog:

MakeMKV BETA popup:
This application version is too old. Please download the latest version at http://www.makemkv.com/ or enter a registration key to continue using the current version.

I also purchased a registration key in hopes ...