It ran without issue for me initially until I turned the watch folder feature on. Once I turned it on, I could not get it turned back off. It would crash before I could get to the control panel. It was a long and painful process to get to a point where it could startup AND have watch folders enabled, and it did not crash. I am there, but it took some time. I doubt most users would be able to do this.

I can't help you with the version question. I did not purchase every major release increment. I have had watchfolder issues with every release I have purchased over the years. V19 is the first one I noticed where the main application does not survive import crashes. The import process ended in previous versions upon encountering a bad file, but the main application continued to run.