connect micro USB on HiLetgo board to computer (mine didn't appear to start up with working Lua, so did flash as follows).
hold the "FLASH" button on the board, press and release the "RST" button, then after a few more seconds release the "FLASH" button.
run this this: ESP8266Flasher.exe for Win64 (see below for links)
-- select COM port (should show up in device manager as "Silicon Labs CP210x...")
-- click "Flash(F)" (progress bar should show progress until finished).
run LuaLoader (may need to select COM port and 9600 baud rate)
you're basically ready to see some output-- set wireless AP defaults through LuaLoader using the buttons, or type some Lua commands to verify Lua is running.
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.
TLDR;
To get the thing running from Windows 10:
-- select COM port (should show up in device manager as "Silicon Labs CP210x...")
-- click "Flash(F)" (progress bar should show progress until finished).
Detailed instructions and links for ESP8266Flasher and LuaLoader are here:
http://benlo.com/esp8266/esp8266QuickStart.html