[*] I have checked the troubleshooting
I just updated from the demo version to the 30 day trial version and I lost all my notes, several days of work…
Launch the app… 
OK. If i rollback to demo, i can view my local notes. So i can save it before update.
It would be cool that the upgrade from demo version copy the local notes to the new installation and sync it with the account.
That’s strange. You should be able to do a back/restore though.
That’s intended behavior because the demo version is a UI demo that lets you see how the UI actually looks and behaves. The normal version stores your notes in an account-specific database. But thanks for letting me know your thoughts!