If Tinderbox is installed and not registered it runs a demo. In demo mode the app is fully functional except for the abilities to add more than 24 new notes.
This means the demo can be used as a viewer for TBX files as there is no cost to downloading and using the demo.
The demo can open and edit TBXs with more than 24 notes—it just cannot add more than 24 new ones. Thus, if trying out the demo it can be useful to download various demo TBXs just to see how larger documents look and to play around with their arrangement of notes.
The demo does not expire and on application of a registration code becomes the full application.