One licence per shop. The software runs on your own machine, so it keeps working whatever happens to us.
Left as prompts rather than invented answers.
Decide: does the app keep working with updates stopped, or does it stop? Say so plainly — shopkeepers ask this first.
Today each install registers separately. Say what you will do when a shop replaces its till.
Your bills and customers never leave your computer. We receive the app version, whether it is running, and error text when something breaks.