[Newcomers Readme!] How To Install UE4 From The Launcher

I tried to get an answer in the “General Discussion”, but wituout success.
So, I try it here again:

My working machines (Win64) are not/never connected to the internet.
Therefore I’ve a seperate Linux computer.

So, what should I do to install UE4 on my offline Windows working computers ?
Perhaps there is a possibility to transfer UE4 from another Windows computer that is connected to the internet ?

Thank you in advance !