I have the eyetv 200 working with eyetv64bit and eyetv 200 on Catalina. It appears to work when Mojave VM in Parallels with Eyetv3 is on. Quitting the VM doesnt seem to affect the eyetv4 functioning. I'm not sure how it works yet. Eyetv4 appeared to start up when i connected the cinergy 400 to the VM as well. More tinkering and i'll hopefully get a clearer understanding as to whats happening.