One thing that you're going to find different about RSLogix 5000 is that it's not a cumulative revision support structure.
With RSLogix 5 or RSLogix 500, if you had the newest software package you had support included in it for every PLC OS and firmware revision in the past.
With RSLogix 5000, each major Firmware revision requires a separate installation of that editor. They do stack on top of one another and run pretty smoothly together (the last six or so revisions) in Windows 7, and when you buy a new copy of Studio 5000 v21, you are eligible to download versions 2 through 20.
When you see the splash screen or the Help-About window in RSLogix 5000, it will show you which versions are installed on your computer.
I personally have 13, 15, 16, 17, 18, 19, and 20 on my XP virtual machine, and 19, 20, 21 on my Windows 7 virtual machine.