Upgrading: You do NOT need to uninstall an existing version of CHIRP before installing a newer one. Just install the new one and it will replace the existing copy! However, be sure to quit CHIRP before installing the new version!
That is on the page where you click to choose Chirp-Next to download (see: https://chirpmyradio.com/projects/chirp/wiki/Download ).
You're absolutely right Ken, but there's an additional wrinkle here. CHIRP itself updates in place no problem, but pipx has some of its own restrictions in that regard and an uninstall->install cadence seems to work the most reliably in the most places. So our download directions recommend that method. But, good point about that statement on the download page - perhaps it needs to be updated to make it clear that it applies to the two main OSes only.
Very well said on all the rest. Thanks for being part of the wider set of "support team" contributors :)
--Dan