The response to a browser closure depends on where you are in the process:
The browser closes prior to hitting the Deploy button.
Re-launch the same browser and continue the install process. Using a different browser forces you to re-start the entire process
The browser closes after the Deploy button has launched the Install, Start, and Test screen
Re-launch the same browser and continue the process or use a different browser and re-login. You are returned to the Install, Start, and Test screen.