Is it normal for me to be unable to download the game in the itch.io app-thing for desktop? It says something about incompatible third party website but I am able to download it just fine if I go to itchio .com
Yeah, that's normal. The wording in the itch app could be a bit clearer. Basically, the itch app can only download games that are hosted on the itch servers. Games that are sold offered through itch but hosted elsewhere you have to download from the itch website.