There is no reason to assign licenses to the Application Stations for DeltaV software components that are not designed to coexist with the redundant DeltaV OPC Data Access Server feature. For example, you should not license subsystems such as Batch Executive, Batch Historian, Continuous Historian, Campaign Manager, or Remote Network on the Application Stations, because they cannot be enabled simultaneously with the redundant DeltaV OPC Data Access Server feature.
If you selected the OPC DA Server and OPC Mirror option on the Redundancy tab of the Properties dialog for the Application Station, the current version of OPC Mirror must be installed on each Application Station. If a previous version of OPC Mirror is already installed on the existing Application Station, uninstall it before installing the current version on both the existing and new Application Stations.