You can tell which release of ThoughtSpot you are using by clicking on the ? icon or Help in the navigation bar.
The Help Center will pop up, with the release number is shown on the bottom of the window.
If no number or a long string of numbers are shown, you are working on a pre-release build.
Here are the versions of ThoughtSpot, with their release dates:
If you are running an earlier version, please contact Support for an upgrade.