what type of laptop/pc do you have ? (mac, linus, windows)
Ran into the same issue. Betting they are trying to download it via the itch app. Sometimes the option to download the game isn't there (it just shows an empty dropdown in place of where you would typically select what version) and you have to open the game page on browser and download it that way. I'm not sure what causes this, but this definitely isn't the first time I've seen it.