Thank you for your feedback! The situation with the UR series being a USB based series is a little different though.
The MR816 has been in the market for 11 years and is a Firewire based interface. Firewire is dead and there are no new systems out there offering direct compatibility without adapters etc.
In addition the OS support for Firewire hasn’t exactly been improved over the last years - quite the opposite. It still works fine on most Windows systems for the time being and it also works on macOS up to Mojave. For Catalina as a 64-bit only OS, we would have to create a new driver and new 64-bit TOOLS. I am sorry to say but at a certain point, with a dead interface standard and new OS requirements, it is simply not possible to invest additional resources anymore.