If the game is launched in the browser and you try to download it through the application, a payment page will open where you can select the option "No thanks, just take me the downloads", at this point a redirect to an empty page occurs (both in the browser and in the otch app) but in the browser everything is fine, and in the application the redirect is intercepted by a windows application and you cannot continue the download. 

This problem is observed in the games:
https://twistcumet.itch.io/five-nights-at-fuzzboobs
https://slutogen.itch.io/blackmailed-incest

This behavior was observed in two independent games, most likely the problem is on the itch app side