I'm on mac and I unzipped the file, and it says "The file can't be opened" T-T did I do something wrong or is the file broken?
Unfortunately, there are apparently sometimes issues opening itch games on Mac :( I don't have a Mac, and I don't know anyone personally who does, so I can't even test stuff on Mac >.<
Thankfully, enough Mac players have spent time on itch figuring out different ways to launch games from here though! So I put together a post of their advice, which you can find here :3
https://melancholy-marionette.itch.io/darling-duality-winter-wish/devlog/227880/...
The tactic that seems to work for most people is to download the itch.io launcher, then download games through that and launch the games from the launcher.
There are other methods on the list though, so, with any luck, you'll find one that works for you :3