It's a free upgrade for existing Stella 5 users (use "Check for Software Updates Now" in the Help menu if it doesn't prompt you automatically).
- Each built-in polyhedron now has a link to my paper model online (where applicable).
- Added Coxeter symmetry notation.
- Ability to cut one edge in a net, not just a whole edge type.
- Lots of bug fixes and minor improvements.
Rob.