Like most software companies these days, Rockwell is pushing the subscription model. Why sell someone an app for a one-time cost and never hear from them again, when instead you can compel them to pay you every year?
You want what's referred to as a "perpetual" license. I expect that Rockwell will discontinue this option at some point if they haven't already. This link has a good explanation of the Studio 5000 options plus part numbers for the perpetual vs. subscription versions:
In today’s article I’m going to take a detailed look Studio 5000 pricing, available packages and bundles, and what features are included with each as it stands today. Studio 5000 Mini: …