Try downloading directly from the website, the app may rarely give you these problems, but it depends on which operating system you are using, whether it is Windows or Mac.
The game is currently only available for Windows
This is the same as gamejolt for Android, there is no way to download it, so I recommend that you try to download it here, because the file is in zip and not .exe or not marked for Windows,the itch io app will not be able to recognize the program or game you want to download
Try downloading it right here and use WinRAR to unzip and open the game and be happy