You'll need to explain what you are trying, and what you are getting in more detail. What do you mean "accessing the add-on via the hosted trial"?
That sentence implies, that you're trying to use Zen Foundation on a Confluence OnDemand install, which is a non-starter as OnDemand doesn't support it. But I really am guessing a lot there, I simply can't tell what you're actually trying from your question,
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