Known issues for PC
•If you are seeing a notification pop-up once a day that started on 7/1 saying that your Windows evaluation copy expires on 7/15/2016, don’t worry – this is a superfluous dialog and your OS won’t expire. The dialog will also go away soon.
Read more at https://blogs.windows.com/windowsexperience/2016/07/07/announcing-windows-10-insider-preview-build-14383-for-pc-and-mobile/#xiDXyH7tHP7LxEqf.99