Click the TotalLength button to open the TotalLength dialog.

Check the types of objects to be included in the TotalLength calculation.

Click the Select objects button to make a selection.

The total length of the selected objects of the selected type(s) appears in the white field of the TotalLength dialog.

It can be copied to clipboard.

Click the Select objects button for another TotalLength calculation or the OK button to exit the TotalLength dialog.

The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin. You may need to restart the Autodesk product to activate the app/plug-in. To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 7/8.1/10) and uninstall as you would any other application from your system.