I haven't seen any sort of thread talking about this, so I apologize if I'm wrong in assuming that most people aren't aware that Giangurgolo released v4.0 of his LazyShell editor back in August of 2014.
Based on this post
he made back in 2015, it seems that this was possibly the last version he will ever officially release.
That said, I have taken quite a bit of time to create a GitHub repository for LazyShell for anyone who wants to contribute to the program's source code for adding new features, fixing bugs, making the program compatible with newer systems, etc.
The repo features a recreation of the version history with commits which are as time-accurate as possible, based off of the timestamps from any code snapshots of the program that could be obtained.
Please feel free to fork and submit pull requests!
The GitHub repository can be found here: https://github.com/jpmac26/LazyShell
You can also download the latest version of the program, including the mysterious v4.0 release here: https://github.com/jpmac26/LazyShell/releases/
Captain Swag, creator of Mario 64 Movie Maker 2.0, maintainer of LazyShell 4.0, and a bunch of other stuff.