When you first install Shield, Watcher or Marvel on ES 2.0, you get a free 30-day trial. The trial license gives you the full capabilities of Shield, Watcher, and Marvel for those 30 days.
When you install the Basic license, it overwrites the trial license. The Basic license does not enable any Shield or Watcher capabilities.
If you need a trial license extension for Shield/Watcher/Marvel, don't hesitate to email info@elastic.co.
Thanks,
Steve