Update information for Nuance Dragon Professional Group version 15.4. There are two installation types for version 15.4: Service pack—For existing Dragon customers. Full build—For new Dragon customers. You can update to Dragon version 15.4 (group) from the following versions: 15 15.1 15.2 15.3   What’s new in version 15.4 General enhancements Automatic Gain Control option now disabled when connected through Remote Desktop. When you