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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.
@Gordon
Did you get this sorted? Maybe you could point us at your Github-pages hosted of the app loader and then I could give it a try and see if I can figure out what's up?
Opening the dev console and typing
Puck.debug=3before upload may give you some clues as to which thing is failing and what the full error is