If you find it does have a stand alone app, and you have a good workflow, I would love to hear about it. In the meantime I got the elements for $40 CAD which will include upgrade offers so I’m happy.
As others have said, RX 11 is indeed a standalone app. I don't have a workflow yet but am getting the hang of the program fairly quickly. I downloaded a trial version of Reaper earlier in the year, but never got comfortable using it and deleted it before the trial period was complete. I have found RX 11 easier to use than Reaper, but YMMV.
So far, I did the initial walk-thru that let's you mess around with a sample track using select tools and found it easy enough to use. I dropped in an old show I was planning to remaster one day and within a few minutes was able to find a handful of tweaks that made it sound way better than what I was able to do before. Granted, some of these tricks may have been buried in Audacity somewhere, but RX 11 was worth $200 based on my experience so far.
I detect some confusion here. Audactity and Reaper are digital audio workstations, swiss army knives for audio editing/mastering. RX is deisgned to "fix, enhance, and polish your audio for music, post production".
I import polywaves into Audacity, make stereo pairs, trim, add track starts, and do some dynamics work there, mostly with normalize and sometimes their sof limiter. RX allows for stem separation, spectral repair, deverb, and all sorts of other fixing kinda things.
According to the website "RX 11 includes the RX standalone audio editor and 20 plugins." Many of the plugins don't work with Audacity, but a few do. After a few years of the workflow, it doesn't really bug me that music rebalance and a few other things happen outside of my DAW. Given how long rebalance takes, and that it's modal, I like having a separate app for it.
Hope this helps