I also had trouble with it finding the printer, until I read and followed the fine print in the readme the installer displays. The printer must be unconnected when you start and connected when prompted.

(Note to developers: you can readily scan the devices on the USB bus for items matching a list of vendor and product ids, thereby finding all currently installed printers of the types you support, rather than this kludge)

The program works OK and with one of these printers provides a much needed office function. Though I think the UI is very much a Mac port of a Windoz program and it shows!