If you are upgrading, it specifically says not to check both options - then it apparently just leaves a 1-2GB of stuff out there forever in your user folder. Is there anything else that get's left behind if you are upgrading from a previous version. Is it safe to just delete the old stuff at any point after upgrading?
I think that "upgrading" line is wrong - I check both boxes when removing a version - for good.
IMPORTANT: Only uninstall the old one AFTER your new version is confirmed to be up and working. If you blow away an older version and check both boxes - you will vaporize your existing library files and the new version - when installed will go on in a plain vanilla verison (no former library etc). I usually wait a week after cutting over completely.
Also - the suggestion about "running MC once" and then uninstalling doesn't work (always). I have 5 machines that we just moved to v19 and on all of them - I fired up MC18 and then tried to uninstall and it did not work. The only thing that did work here was to reinstall MC18 over itself...and then uninstall. That worked perfectly.
I also have a comment of the reasons/choices presented when one does uninstall. If JRiver is doing anything meaningful by asking these questions to the user - why is there not a choice like "I love MC so much - I am upgrading to the new version" ?
VP