Well you didn't make that clear in your initial speel about getting all future upgrades.
You tried to pull a fast one, it didn't work, and now you'll have to back-track and clarify.
Haha. You knew what you were doing. You were trying to fish people in un an underhanded way by not making it clear that the one-time purchase isn't _actually_ a one-time life time purchase with all future updates for free. Take the L and move on.
You've read me like a book! When you grow up, you should become a detective. Or a business consultant, as you are equally good at figuring out why people buy stuff.