If I sell you code that is compatible with the current version of UNA, I don't see why I should be obligated to provide a free update for a new version tomorrow. If I choose to sell an update, I will; if not, I won’t. If you agree to these terms, you are welcome to purchase it; if not, you are not obligated to. I provide you with open-source code today, and if you need an update in the future, you are free to hire someone else to make the necessary changes. Unless there is a contractual agreement to provide updates, you cannot demand them for free. As an example, all the products I've seen from UNA INC with updates typically require an annual subscription. If you don’t buy a subscription, you can’t expect to receive updates. If you receive a free update, that doesn't mean it's mandatory, it's just voluntary.