So I have tried now installing Cubase Pro on the Bootcamp partition of my 2019 MacPro. I did a test with the 2014 MacMini listed above. I also did a test with a Windows 7 laptop.
Both sessions ran and recorded fine. In the Files Manager and Recordings sections of the Plugin, I could see all the files on the remote computer and my performer friend verified that they were locally on his computer.
But when I press the Get HD Files Button the transfer happens and we both see progress bars, but the HD files inserted into my session are STILL blank.
Am I doing something wrong in the plugin?
(these latest round of tests were done with 188.8.131.52 on both sides)