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I have been using an Arduino to control a router for a few years using Estlcam, takes Gcode

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'm guessing the Boxzy software is using some of the Arduino libraries, which is why it needs the Arduino software to be installed first.

As Doddy has mentioned, I'd guess they're also using GRBL...

**** NO EXPERIENCE HERE ****

(Agree with Adrian_S - the firmware running on the Arduino doesn't/shouldn't need reloading - that's a one-off configuration thing; re. drivers?, possibly - though...

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...