Hi,

I've tried following the instructions in this link below, but it should be for compilation experts, because it is summarized.
https://github.com/arduino/Arduino/wiki/Building-Arduino

I see a part that says 1GB of download, but it only has 84MB. (So how to get all 1GB?)

(Note: The download size is greater than 1GB and might hog all your bandwidth for a long while if your download speed is slow, such as a dialup connection or anything below 8mbps)

I suggest that the instructions be reviewed and, if possible, more detailed.

I found these instructions that may be useful for others who are not so familiar with this build type:

Windows:
https://www.instructables.com/id/Build-Arduino-IDE-From-GIT-Sources-on-Windows/

Ubuntu:
https://www.instructables.com/id/Build-Arduino-From-GIT-Sources-on-Ubuntu-1604/

Thank you.