Look at first page of the thread:
USB-to-Serial Port driver (start Terminal in Start-Programs for configuration).
RS232 USB Serial Driver (start RS232 USB Serial Driver in Start-Programs for configuration).
You must know EXACTLY the serial protocol used by your device.
If the device still asks for Manufacturer, write a generic name, for ex. "Generic Serial", if correctly configured and your device is not protected against other than its manufacturer driver, it should work, just continue to configure the protocol.
If it refuses, than it's the device which "is protected" against other manufacturer driver.
Which means the manufacturer wanted from beginning to stop using the device in other environments, a simply way to make more money