Is Actually quiet easy, here are the steps:
- Find another Mac running OSX 10.10 or higher
- Go to the App Store and sign in with your Apple ID
- Download and install the latest version of OneNote
- Go back to the Mac running OSX Mavericks and open the App Store
- Go to Purchased and download OneNote from the list
- When you click download, it will suggest you are able to download a previous version.
Congratulations!!
OneNote is now associated with your Apple ID and you can installed on any OSX version.
If you don't have a access to another computer running 10.10 or higher, you can backup yours, upgrade to latest OSX, download OneNote and restore your Mac to Mavericks. OneNote will be associated with your Apple ID after being install for the first time.