If you lack a support contract or cannot get v20 to install, consider these legal alternatives:
Many integrators keep legacy software versions. They can go online with your controller, perform modifications, and deliver a new .ACD file without you needing the software locally. rslogix 5000 version 20 download
One of the most impactful features added in Version 20 was the ability for a single computer to communicate with multiple controllers simultaneously over different communication paths. Previously, RSLinx Classic had limitations regarding opening multiple driver windows. V20 allowed developers to connect to several PLCs at once via Ethernet, greatly simplifying multi-PLC system commissioning and monitoring. If you lack a support contract or cannot