To convert polylines to multilines, type PLML in the command line and press enter or click on the ribbon button at the Add-ins tab. Then, select the polylines you want to convert to multilines and press enter. Pick the multiline style in the dialog box, and select the justification and scale of the new multilines. Then, press ok and it will be done.

To convert multilines to polylines, type MLPL in the command line and press enter or click on the ribbon button at the Add-ins tab. Then, select the multilines you want to convert to polylines, press enter and it will be done.

To change multiline styles, type STML in the command line and press enter or click on the ribbon button at the Add-ins tab. Then, select the multilines you want to change the style and press enter. Pick the new multiline style, press ok and it will be done.

The installer that was run when you downloaded this app/plugin from Autodesk App Store will start installing the app/plugin. OR, simply double-click the downloaded installer to install the app/plugin. You may need to restart your Autodesk product to activate the app/plugin. To uninstall this plugin, 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 system application.