I hate to bust anyone's bubble, but it is not the job of a software developer to ensure that future versions are compatible with third party addons or hacks. Plain and simply, if you paid for third party mods for Dolphin 6.x.x, it is not the responsibility of Boonex to ensure that those mods will still work with a major revision. Sorry... that's life in the big city.
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However, the party that you received the paid mod from, should for a nominal upgrade charge, provide an upgrade mod for the see more newer release of Dolphin. That's how it works everywhere else in the software world and there's no reason to expect things to work any differently here.