It's not a faulty installer, it's code developed for an entirely different system (UBB.threads v6); if you installed UBB.threads v6 it'd work just fine; though nothing that is remotely current would work, at all. Plus, it wouldn't work with mobile devices, and considering they have such a huge portion of the market share now, you'd be alienating your users...

Trust me, come up with a better option than FlashChat, it's dated and needs to just die.

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