Start the plug-in with the command C2PL or CURVES2POLYLINE in the command line or click on the icon in the toolbox or on the Add-in ribbon.
The plug-in starts and you can select objects to join or you can go to the settings with the ENTER button.
Select single objects or many objects at once. You can select objects before invoking the plug-in.
When selecting objects, all objects that cannot be processed (TEXT, MTEXT, ...) are automatically sorted out.
The plug-in converts the objects into polylines and joins them together if they are in touch.
Objects on different Z levels will be joined too.

Settings
The settings will automatically be saved in a configuration file if you leave the dialog with the OK button.
The settings made are also available when opening a new drawing or when restarting Autodesk® AutoCAD®.

• Z-level (standard value 0.00)
  Sometimes you want to have the polyline on a special elevation level (Z-level). Enter a height and the new polyline will create on this Z-level.
  
  
• width (standard value 0.00)
  If you want polylines with width, you can insert the value for the width here.
  
  
• fuzzy distance (standard value 0.00)
  Enter a maximum distance. Objects that do not touch, can join within that distance.
  
  
• spline precision (standard value 10)
  In the object selection of a spline, you need a value between 0 - 99 to convert the spline into a polyline.
  A value of 0 makes a rough polyline from the spline. A value of 99 makes a very fine polyline.
  
  
• keep base objects (standard value off)
  Sometimes you need a polyline but you want to keep the base objects too. With this option, the plug-in makes the polylines and keeps the base objects.

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 7/8.1/10/11) and uninstall as you would any other application from your system.