RSNetWorx for DeviceNet v21 is available through the official Rockwell Automation Product Compatibility and Download Center, requiring a valid TechConnect contract, serial number, and RSLinx Classic v3.51.00 or later. This version update is mandatory for users installing Studio 5000 Logix Designer v21 due to significant changes in EDS file handling. Download the software and check release notes at Rockwell Automation PCDC Rockwell Automation Find Downloads - Rockwell Automation Compatibility