“launchPackager.command” cannot be opened because it is from an unidentified developer

You have to go into your settings and allow this particular app.

1. Open system preferences
2. Click 'security & privacy"
3. Bottom right click " Click the lock to make changes"
4. Enter password
5. Under the general tab where it says ' app store and identified developers ' you should see your blocked app.
6. Final step: click "open anyway"

Hope this helps.