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problem with liberia <ESP8266_Lib.h>

hi, i am new to this community.
I started using arduino some time ago, now I wanted to use an esp8266 version 1 module to transmit the temperature and humidity given by a dht22 sensor to the blink app.
I know practically nothing about the management via wi-fi with esp8266 but I took the file for dht22 from blink. My problem is that there is no program for the liberia (<ESP8266_Lib.h>) that I can’t find to install? I have seen that some use the esp8266wifi liberia but I can’t find it too

you need to install esp8266 board at first

sorry I never used the esp8266 module what do you mean? (in the end I managed to find the library)