i found the issue. for whatever reason, trying to download drain mansion on windows in the itch.io app flat out doesn't work. you have to go to the itch.io website, download it there, extract, and then it has the executable in it.
Ohh sorry, I have never used the itch app, so I didn't know.
it's fine, a lot of people probably don't use it, but for ones who do, it'd be a good heads up to read this.
