I bought Voxatron through the Humble Voxatron Debut. I followed all the steps, including the ones in predcon's comment. When I click the activation link, it brings me to a page that says "Key not found", but shows the key right there and has a box below that lets me put in a key to redeem (which doesn't work either).
Could you please help me?

Fixed -- try again now (same key should work)

Thanks! Worked perfectly.