In fact there are many Onetastic users who are still using OneNote 2013 or OneNote 2010. So if you depend on Onetastic on OneNote 2016, you will be able to continue to use it for several years. We will continue to develop and support Onetastic as long as OneNote 2016 is supported by Microsoft. OneNote 2016 will still be supported till 2025. OneNote Windows 10 app currently does not support add-ins. Microsoft created a page with some frequently asked questions about this topic which you can find here. We’ll continue to offer support, bug fixes, and security updates for OneNote 2016 for the duration of the Office 2016 support lifecycle, which runs through October 2020 for mainstream support and October 2025 for extended support. If you currently use OneNote 2016, you won’t notice any changes when you update to Office 2019. OneNote 2016 is optionally available for anyone with Office 365 or Office 2019, but it will no longer be installed by default. While we’re no longer adding new features to OneNote 2016, it’ll still be there if you need it. Below is a part of the announcement regarding the support policy for OneNote 2016:

The original announcement by Microsoft can be found here. This left some Onetastic users wondering what will happen to Onetastic and whether they will be able to continue to use it. Several months ago Microsoft announced that they will be focusing on the new Windows 10 app for OneNote and that they will not be adding new features to OneNote 2016.

Install onenote 2016