Stream - Without the internet

Morning All

I kindly understand the steam activating the game but I don’t have access to the internet.

I have the box version and would like to know if I load the game at my brothers ( internet access ) and activity the game ( offline ) would I be able to install it on my home computer without going on the internet.

Thanks

You need to connect the PC you're going to play the game on to the internet once to authenticate it, you can't transfer it from a net connected PC to another one.