There are two ways to install this utility for use in AutoCAD.
AutoCAD LT is a CAD software developed by Autodesk, designed for users who need to create, edit, and manage 2D and 3D models, but don't require the advanced features of the full AutoCAD software. AutoCAD LT is ideal for small businesses, freelancers, and individuals who want to work with CAD files without breaking the bank.
If you need even more features than a basic total length calculation, consider looking into these advanced LISP scripts:
Estimating cable lengths, pipe runs, fencing, and landscaping paths.