I've just encountered Spriter for the first time (during the Global Game Jam). I would love to use these Spriter animations directly within Unity, so I'm quite excited about your project.
But I'm less excited about keeping up with this thread and managing the package manually. Have you considered submitting it to the Asset Store? You could even charge a few bucks; even though it's free, I'd gladly pay for the convenience of having it right there with all my other assets, easily check for and install updates, etc.
(Or you could make it a free asset, if that's what your conscience demands, though I certainly think you deserve some funding for all your hard work.)