This is an issue with Itch's UI and I have no control over it. I've had multiple reports of people not knowing where to download the updates or the download not working. Best I can offer is to try the downloads from your Itch library at /my-collections
Someone else was having issues doing it through the Itch app and said: "I had to move and extract the 5.3 folder into the Choicer Voicer within the Itch app folder instead of the one in YeahMaybe"