Researching VR tools

My boss has a vision.
He owns a flooring and tile company and would like to display VR showers or other tile works to his customers. But in a way they could build it virtually to visualize.
I can do them with Cinema 4d or 3dsMAX, but for a customer I realize it would have to be something very user friendly, like a game, hence here I am.
Here are a couple questions,
I have no internet at home where I would be spending most of my time in dev.
Does UE need to access internet during startup?