Hi John -
mine is working fine under Catalina 10.15.
Great! If you would try, in Terminal:
# with nanoVNA powered off, enter:
ioreg -p IOUSB -l -w 0 | grep "USB Product Name" > without
# then power on nanoVNA and enter:
ioreg -p IOUSB -l -w 0 | grep "USB Product Name" > nano
# finally
diff nano without
# the result on my Mac shows a "ChibiOS/RT Virtual COM Port" driver used for nanoVNA
< | | "USB Product Name" = "IOUSBHostDevice"
< | | "USB Product Name" = "QUAD-CAPTURE"
< | "USB Product Name" = "Polar V800"
< "USB Product Name" = "ChibiOS/RT Virtual COM Port"
---
| "USB Product Name" = "IOUSBHostDevice"
| "USB Product Name" = "QUAD-CAPTURE"
"USB Product Name" = "Polar V800"
Oristo