Follow this walkthrough to obtain the official installer package:
To download , you must use the official Rockwell Automation Product Compatibility and Download Center (PCDC) . This software is proprietary; while the download itself is initiated through the portal, a valid serial number and product key are required to complete the process. Download and Installation Steps Access the PCDC : Visit the Rockwell Automation PCDC. rslogix 5000 version 20 download
Version 20 introduced several significant updates that improved programming efficiency and system integration. Follow this walkthrough to obtain the official installer