The problem and solution are both in the message you posted. You opened this post saying that it doesn't work under Python 3.13 on Windows, but your error message says that you're running 3.14. It's not that pystray will never support that version of Python; it's that pystray doesn't yet support that version of Python. Unless you're using some other module that needs the bleeding edge of Python, you can solve this by staying a couple versions behind (like 3.12) until everything else you need in your app catches up to 3.13. Then you can upgrade your app to use 3.13, and so on.