You are right. Five years ago I started working on a new release of SG to add features discussed
here. However, during development, I noticed some of the requested features cannot be added to SG. SG was initially designed for demonstrating simple graphs, and the new features needed a generic graph infrastructure. Because of that, I stopped working on SG and instead decided to develop a new set of components as a more sophisticated graphing tools. Well, as you already now, I never started the new components and definitely I'll never do.
The attached compressed file supposed to be SG v3.0. It's derived from v2.61 of the component. Be aware that the attached component doesn't accumulate the bug fixes applied to the original component after v2.61, the new code is not verified and may have major bugs, and no support is available at all.