1. Install latest Arduino IDE.
  2. Download and install Blynk library
    (follow instructions of the latest release package).

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:

Troubleshooting

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.

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