Oh, mistook that for an error caused by the backslashes.
You need to run it from a location that can see the .bin files you downloaded, or include the path to those files in the the command. It's starting from the directory you're in when you run the command.
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.
Yeah, the slashes to do line breaks only work on Linux.
You need to have python 2.7, not python 3.x (this seems to be true of just about all python code I've had to run)