I'm not sure what the issue is, but sometimes that's what itch.io says when you go to download a game. I think it's certain websites used for hosting that itch.io doesn't cooperate with, for some reason.
Viewing post in Crossdressing in Camelot comments
Can you try visiting this link directly then maybe? It's the same link as the game's download. Seems odd for it to be an issue with itch.io, or I'd assume more people would be mentioning it, unless it's some sort of setting on the site? https://mega.nz/folder/1LgGSZBJ#X8hdrq7Gdd7BUjiOyEpF6w