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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@ajkm
Thanks, Gordon.
I ended up using nRF Toolbox because I couldn't use the Web IDE - that was downloading the Hex file instead of the zip file, so kept returning the error.
All's good for now though!