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Thanks to Nomad games for the support and clearing up the issue!
Will add my name to the list of those who still have a duplicate key. Have emailed desura twice, and they've responded that they're waiting for the developer to supply working keys. It's been a couple months now.
Just wanted to let you know that while I tend to play steam games almost exclusively these days, I bought indieroyale gaming tuesday just for Aeternum. Looks and sounds great, the PC needs more horizontal shmups. So does greenlight *wink*