FactorySoft clients often rely on specific OPC Proxy/Stub DLLs. If you install the client but get "Class not registered" or "Interface not supported" errors, you are missing the OPC Core Components.
Because the LDS often uses the same port (4840), it can block your client's connection. Use the Windows Services Manager to stop the "OPC UA Local Discovery Server" and set its startup type to . Troubleshooting Tips How to set up OPC client? factorysoft opc client install
Since FactorySoft tools are often distributed as part of a toolkit or a standalone executable: FactorySoft clients often rely on specific OPC Proxy/Stub