To order the latest version either use KiCad or use release zip from GitHub.
To generate the Gerber files yourself, open _monster7800.kicad_pcb_ in KiCad. Use _Fabrication Output_ > _Gerber_ and select an output folder and agree with _Plot_ with the default configruation. Also use _Fabrication Output_ > _Drill Files_ than select the same output folder and agree with _Generate Drill File_.