How to get the latest fix from github?

I downloaded .zip file from here: GitHub - esp8266/Arduino: ESP8266 core for Arduino and tried to install with Arduino IDE but got this error message: "Specified folder/zip file does not contain a valid library".

It supposedly contains I2C fix I need in wire-library and which is not in the latest release (2.4.2).

So, how do I get this installed, or what do I have to do to get the fix in?

Thanks,
Tipo

tipo1000:
but got this error message: "Specified folder/zip file does not contain a valid library".

That is exactly right. GitHub - esp8266/Arduino: ESP8266 core for Arduino is not a library; it's a hardware package (AKA "core"). You can't use a library installation technique to install a core.

In order to install the latest (beta) of GitHub - esp8266/Arduino: ESP8266 core for Arduino, you only need to follow the "Using git version" installation instructions they provide:
GitHub - esp8266/Arduino: ESP8266 core for Arduino