I’m typically running the latest install as the IDE. It remembers everything from the previous IDE, I just add the now-most-recent version as a “version”. That’s all described in this thread: Multiple Active Clarion Systems (MACS)
Once that’s done (which take maybe a minute to set up) I can then take apps and compile in this build, or switch to that build and so on. So I can test for changes, check if some behaviour is new, or was there before, and so on.
All this works for Clarion itself, but also for 3rd party stuff - hence the NT10, NT11 and NT12 folders.