License terms for unique interactive installation in museum

Hi guys we are a small digital art studio specialized in digital interactive art installations for museum. Usually we use our in-house engine but this time we want to explore the UE4 capabilities to create a realtime virtual simulator of galaxies connected with the principle of dark matter. The installation should be one dual screen (a touch monitor and a projector) and will be permanent in the Science and Technologies Museum Leonardo Da Vinci in Milan inside the new area about space and universe.
The software will not be sold to public in anyway and will be used only by the museum for the installation and for promotional and learning purposes at CERN. We want to be sure to agree your license terms and share with you our new project. Thanks!

Yes that’s fine - no royalty.