Cool it there.
You haven't heard an official reply in three and a half hours and nobody is taking responsibility? Wow...
If the retailer klutzed up with the sticker like that I would think you have enough to make a claim for a refund. I can't imagine a store (or rather its manager) telling you to your face that you should've thought to check online before making the purchase. I mean, typically a newer Mac can emulate older programs so it isn't like you should've known it wasn't going to work.
This forum isn't an "offical" channel to Encore, so if you rather would want a reply from them I suggest sleuthing up an email address and ask them. Be prepared to wait more than three and a half hours though.
Personally I'd go back to the store and ask them for a refund as they sold it with the (unusual) system requirements covered up.
Good Luck!
/Tiny Attempt
P.S.
Who are the ones you mean are "pointing fingers elsewhere"?