Install ESP8266 core for Arduino IDE
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Then, open the Arduino IDE, then select in the menu:
File -> Preferences
(Arduino -> Preferences for Mac).Click on Additional Boards Manager URLs button and add this link:
http://arduino.esp8266.com/stable/package_esp8266com_index.json
In the Arduino IDE open:
Tools -> Board -> Boards Manager .
Search for esp8266 , and install it:
In case you see Error downloading http://downloads.arduino.cc/packages/package_index.json like this:
You need to find folder
Arduino15 or .Arduino15 and remove all files inside with package word in name.