The command to start the program is JTBCatenary (JC for short).

The JTB Catenary Window will bring up. Firstly, you have to select 2 base points. If you want a multi-span catenary, you can continue to select other points of other spans on the CAD screen.

To build the first span, besides the 2 first base points, you have to specify one more property to make the catenary determined. It can be the length, the sag, the incline sag, or an immediate point that the catenary will go through.

If it is a multi-span catenary, another span will be drawn based on the first span's property. The base property to be chosen can be the length, the sag, the incline sage, or the tension at the sag.

The resulting catenary will be created in the current drawing (DWG or DXF) as a polyline with the width being the same as the diameter.

The installer that ran when you downloaded this app from Autodesk App Store will start installing the app. Or, double-click the downloaded installer to install the app. You may need to restart the Autodesk product to be able to run the app.

To uninstall this app, exit the Autodesk product if you are currently running it.

On Windows 11 and 10 version 1703 or later press Windows+I on the keyboard to access Settings or click or right-click the Windows Start button and then select Settings. Click on Apps (optionally followed by Apps & features). On older Windows versions click Control Panel > Programs > Programs and Features or Control Panel > Add.

Catenary Sample.dwg is found in the folder %ProgramData%\JTB World\JTBW-Catenary.bundle\Contents\Sample

For further documentation visit JTB World's JTB Catenary page.