Hi,
Based on my research, OneNote for Mac now is only compatible with OS X 10.10 or later. If you previously installed OneNote for Mac and are on OS X Mavericks (10.9), you can continue using the older version of OneNote for Mac. However, in order to get today's update or any future OneNote updates, we must upgrade the OS to Yosemite 10.10 or later.
Since this forum is for general questions and feedback related to Office for Windows, if you need further assistance regarding this issue, I'd recommend you post a new question in the OneNote for Mac forum:
http://answers.microsoft.com/en-us/office/forum/onenote_mac
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Steve Fan
Forum Support
Just wanted to say hi and check if there is anything that I can do for you on this problem. If so, please do not hesitate to let me know and I will be happy to help.
Best Regards,
Steve Fan
Forum Support
Hi,
I'm marking the reply as answer as there has been no update for a couple of days.
If you come back to find it doesn't work for you, please reply to us and unmark the answer.
Best Regards,
Steve Fan
Forum Support