The three prerequisites, which are available on Mac, Windows, and Linux are (we have tested with the versions below, but other versions may be fine too):
Once you have Virtualbox and Vagrant installed on your machine, you can:
vagrant plugin install vagrant-vbguest
git clone https://github.com/smart-on-fhir/installer-service
cd installer
vagrant up
... wait ~10min while everything installs (depending on your Internet connection speed).
Now visit http://localhost:9070
in a web browser on your local ("host") machine.