I recently tried to load MicroPython on ESP8266 board, but failed. To do that I had to install esptool. I successfully installed it but when I wanted to use it, it would not work.
For instance,
esptool.py --help
'not recognized as internal or external command, operable program or batch file'
I found many questions on this topic, but none of the answers helped me. I tried adding everything to the Windows path and it still did not work.
Try installing esptool using pip command on Windows. Then use only "esptool" instead of "esptool.py"

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