Foozed
If you're still having trouble assigning the slave doser numbering, please use this version of GCC:
https://www.dropbox.com/s/hqc7b162x6...0.9.2.zip?dl=0

When you install this version, make sure the USB COM connection is set to AUTO.

When you connect the USB cable to the doser and PC, you should see your device listed in Windows Device Manager, GHL Virtual Communications (COM #).

If you instead see it with a yellow exclamation mark, please uninstall this driver and reinstall by following these steps:
https://www.youtube.com/watch?v=5arEm807628

If you do not see the device listed at all, please follow the steps in the link above.