I received a new Keyspan USA 19HS device on June 5, 2012. I installed the accompanying MAC OS x driver software that said it would work for MAC OS 10.2.8 or later. After re-booting and connecting the device, I did not the serial ports.
Then I found that a beta version of this software exist for Lion 10.7
I installed that on top of the older drivers, rebooted and connected the USB serial adapter again: same result.
Now I hear I first have to uninstall the old driver, however i cannot find these following instructions by using Terminal program, using sudo command etc...
What can i do now?