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Version 20 is considered one of the most stable releases of the legacy RSLogix line. Many large OEMs validated their machine designs on v20 and refuse to change without extensive recertification.
Versions 20.04 and above fixed the infamous "minor revision" compatibility headaches of the past. rslogix 5000 version 20 download
If you have a PLC running Firmware Revision 30, you cannot use RSLogix 5000 Version 20 to program it. You must match the software version to the firmware version (or use a higher version of Studio 5000). Version 20 is considered one of the most