Yeah, it’s pretty old, the editor portion still works, the ARX used for loading/debugging/compiling projects is dated at AutoCAD 2015.
The author was from my home town, kinda cool. I was in contact with him to try and make a version for BricsCAD, but unfortunately the guy passed away.
It has a few features I like, such as localizing variables , being aware of arguments “(defun OpenExcel (file / book exl)”
And my most favorite feature is “CTRL+M” selects a block of code.