Please first install Arduino IDE (from previous post) and then follow the below steps to enable development of ESP8266 and ESP32 boards. For ESP8266 board: Go to File->Preference->Additional Boards Manager URLs , field and put the below URL. https://arduino.esp8266.com/stable/package_esp8266com_index.json Now go to Tools->Boards->Board Manager and search for esp8266 by esp8266 community and install it. For