Revit LT provides many RPC objects that you are licensed to use in rendered images for Revit projects. If you purchase additional RPC content, you must use ArchVision™ Dashboard to manage it.
For instructions, visit http://help.archvision.com.
If your organization uses additional RPC content, you need to configure Revit LT to connect with ArchVision™ Dashboard. See Configuring Revit for Additional RPC Content.