This works:
1. Using App Uninstaller/ Clean my Mac to uninstall Evernote, such tools delete the App and some not-so-obvious files generated from Evernote.
2. Reinstall the Evernote.
I'm using the Mac version of Evernote, and every time I add a picture to the note; it asks me to upgrade my account, which is very annoying for constantly interrupting. Can we stop the 'upgrade account' or the 'upgrade Evernote' popup?