Installing UE4 online to then transfer to offline computer. Help!

I am trying to find instructions to how I download UE4 on my Mac with internet, to then give to my brother via SD so he can use on his off-line computer, where he has no access to the internet.
I can see that I have to download the launcher, but how do I then get UE4 from my Mac, to SD then onto another Mac that is offline?

I have read through so many forums but they’re all around 6 years old. If we are successful and my brother has the software and using offline, will he need to connect to the internet at all after a period of time to verify, or is the only internet needed during the initial download and install? Or is there maybe a version that does allow this to work that isn’t the latest?

Appreciate your time and help!