Based on my understanding, you are encountering difficulties with the support package of your Arduino hardware. If you are not using Catalina 10.15.1, you can try the following troubleshooting steps:
- Switch the Arduino board to a different port on your computer.
- Check if the COM port is set up correctly.
- If the error message seems to be a temporary glitch, remove the board from the host PC and reconnect it.
- Press the "Reset" button on the hardware when you click on the "Program" button from the hardware setup screen.
However, if you are using Catalina 10.15.1, the recommended solution is to upgrade your macOS version to macOS Catalina 10.15.2.
Hope it helps!
