user39090: I trying to add library here but it doesn't seem to work https://github.com/esp8266/Arduino
This happens
"Specified folder/zip file does not contain a valid library"
This problem make me no longer upload any library. any solution about this??
Manual installation does not either.

user46852: You don't install that repository as a Arduino library.
Read the README file in that repo. It explains how to install it using the Arduino IDE Board manager. That's the correct way to install it.

39090: <p>I trying to add library here but it doesn't seem to work <a href="https://github.com/esp8266/Arduino" rel="nofollow noreferrer">https://github.com/esp8266/Arduino</a></p>

<p>This happens
"Specified folder/zip file does not contain a valid library"</p>

<p>This problem make me no longer upload any library. any solution about this??
Manual installation does not either.</p>
 46852: <p>You don't install that repository as a Arduino library.</p>

<p><strong>Read the <a href="https://github.com/esp8266/Arduino/blob/master/README.md" rel="nofollow noreferrer">README file</a> in that repo</strong>. It explains how to install it using the Arduino IDE Board manager. That's the correct way to install it.</p>
