VCDS Lite selects the port, don't think you can influence it yourself. Just run test on the first vcds screen, to see which port it's using (probably 3 or 4).Finally...I have the cable recognized on the port list as "USB serial port COM8"
My problem is that if I delve into the advanced properties I find that COM 1-7 are all in use...
Although, on the device manager list it only shows COM1, 2 and 4
PS to get this far I had to uninstall both VCDS and VCDS Lite. The full version probably wouldn't have worked without a dongle cable anyway