I am trying to flash an esp8226 WiFi module. I am using ver 1.8.13. Per instructions I have been following I need to go to preferences then to additional boards manager URLs: and type in the following, http://arduino.esp8226.com/stable/package_esp8226com_index.json
Then I go to the board manager and search for the esp8226.
The error message pops up as soon as I open the board manager.
If I bring up the additional board manager URL pop up box and put the address in there and click the text that states for a list of unofficial boards support URLs it opens a web page that has the esp8226 code.
Any idea of why the board manager won't download this.