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It all depends on what they put in the Arduino. If it's a version of Grbl then you have quite a choice, Universal Gcode sender, Candle , bCNC are three that spring to mind immediately. If it's unique...

I can't see why you have to re-upload the Arduino code to your Boxzy, since it was just the laptop software that went kaput? You ought to be able to just install the software on the laptop and start...