Richard,
On your Github page it says "Supports Print, Plot, and Gerber Output - Print Preview", but this does not appear to be the case. I cannot find any kind of plot/cam output features in the program itself or the source code.
Hey tycz,
Regarding Gerber: This software can generate pcb file. As long as the output is a gerber printer, there's no need to compile special gerber file—selecting the laser photoplotter device automatically produces the film. From a software perspective, this is the same type of output as printing or plotting.
However, older Gerber photoplotters with fixed apertures cannot be supported, as manual aperture matching is no longer practical.
That said, if the goal is to send files to a PCB manufacturer, then gerber output is not supported. Manufacturers require the PCB design files directly. It is recommended to export the design in formats such as AD6 or Protel for manufacturing purposes.
There's another solution you may try, that is to download a laser photoplotter driver(I don't know the exact name), then select print to file, that should automatically output a gerber file.