You do not need to download a specific "Lite" installer. The installer you download is a universal package for RSLinx Classic. When you install it, it will default to the version if you do not have a paid license key installed on your machine.
The version is free to download and use. It provides the essential "RSLinx Classic" interface that looks like a tree structure, allowing you to see the IP addresses of your CompactLogix or ControlLogix processors and verify that your cable is connected properly. rslinx classic lite download
Think of RSLinx as the "traffic cop" or the "middleware" of the Rockwell Automation ecosystem. It handles the communication between your computer and the industrial hardware (PLCs, HMIs, drives, etc.). You do not need to download a specific "Lite" installer
Have you run into issues installing drivers or seeing your PLC? Let me know in the comments below! The version is free to download and use
Difference between RSLinx Classic and RSLinx Classic Lite. What is the difference between RSLinx Classic and RSLinx Classic Lite ? Rockwell Automation