It's a amazing how many folks have a "Government is hiding something" default setting here. Who, without reading the background material, conclude that the Kansas Secretary of State is stonewalling with the "it's not legal to release this information" argument.
Under KS Secretary of State Kris Kobach, creator of the 2-tier voting system (you must provide proof of citizenship, e.g. passports to vote in state and local elections, but not in federal elections because federal law prohibits using that same type of restriction on the federal voting registration paperwork) I'd absolutely believe that he's hiding something. He's shown a history of official decisions that can at least be interpreted from the outside as motivated by politics more than the law, and if there's something squirrely going on with the voting machines I'd be unsurprised to see him working to keep it covered up.