Updates for new features available in MIT App Inventor release nb190. More details at
https://appinventor.mit.edu/ai2/ReleaseNotes#nb190
Note: The MIT AI2 Companion is not a stand-alone application. It is intended to be used with the MIT App Inventor system, a web based App Building tool which is free to use.
You can learn more about MIT App Inventor at http://appinventor.mit.edu