1. Select button WallFromLine to trigger the add-in. 
2. Select Revit detail lines that you want to build the walls from. 
3. A dialog will appear to ask you to select WallType, Level and wall base offset. You also have option set tolerance value which allows you to deal with slightly incorrect geometries of detail lines. 
4. Click OK.

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.

The 30 days trial with full functions will be active immediately after installing the tool.