How to install and run on the offline PC machine
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I'm not familiar with the Arduino CLI. But I suspect that you can do the following (which works with IDE 2.x) assuming the operating systems (Linux, Windows, Mac, ...) are the same.
Install the CLI (or IDE 2.x) on a computer with internet access. Install all board packages that you need. Copy those to a memory stick (or similar).
Place the memory stick in the offline computer and copy it all to the locations where you found them on the online computer.
You can repeat for needed libraries; those are not dependent of the operating system.