Downloading and installing the new Arduino IDE for ESP8266

Moderator: igrr

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By alextg
#65587 Can't resolve arduino.esp8266.com
Any installing method fails: the normal method (Preferences - Boards manager link) and even the manual installation, because get.py has anyway to go to arduino.esp8266.com in order to download "...xtensa-lx106-elf-gb404fb9-2.tar.gz".

So, I'm in trouble because of this. Any suggestion? Is there a way to have a COMPLETE package able to install the Board Package in Arduino IDE WITHOUT DOWNLOADING OTHER STUFF FROM THE NET... an offline installation?
Thank you.