@Rolling Crown - this appears to be an issue with itch's launcher. I used the 'manage' option to open the folder where the application was saved, and double clicked the demonheart.exe, and the game opened just fine. I have had a similar issue and solution with LustDoll, and WolfQuest's recent patch has reported the same issue, so I don't think it's a Demonheart issue as much as it is a Itch.io issue