Could not install ESP8266 Q&A Forum › Category: ESP8266 › Could not install ESP8266 0 Vote Up Vote Down Phaykeo Chanthalangsy asked 3 years ago After installing arduino 1.8.16, I have tried to install ESP8266, but could not do so. It was said “Error downloading ….” Thanks for any helps 1 Answers 0 Vote Up Vote Down Sara Santos Staff answered 3 years ago Hi. Can you try again? Can you double-check that you’ve copied the URL correctly to the Additional Boards URLs field? Regards, SARA