When trying to install a printer with Printer Installer by PrinterLogic, you may get this error:
Printer Installer Client Interface
Unable to install printer: A different port by the same name already exists. Delete or rename the port: <<Port Name>>.
This is caused because the printer port has already been created (probably in a previous attempt to install the printer). Consequently, Printer Installer is unable to install the printer because it can’t create a port with a duplicate name and it’s not smart enough to use the same port or delete the erroneous port. To fix this error, delete the printer port in the error message, then reinstall the printer.