The keyword "install" is tricky. Maybe the characters are installing something new in their lifestyle, like moving to a new place, adopting a new habit, or a technology like a smart home system that becomes a metaphor for their relationship's complexity. Or maybe during the film's distribution, it's something you have to install to watch, but that's more technical. Not sure. Maybe it's better to focus on the story elements and the installation of new aspects in their lives, like building trust or changing their lifestyles.