SUMMARY
Since the upgrade to plasma 6, no applets, plasmoids, themes, etc.  can be updated (if for plasma 6) or re-installed (if originally for plasma 5). The error is always the same: clicking the install or update button raises a dialog (twice, actually; it reopens immediately after closing) which informs the user of something which will resemble the following (redacted userl info, but left the particular plasmoid, which is only for plasma 6)

Installation of /tmp/jvLiNx-plasmoid-panel-colorizer-v0.3.0.plasmoid failed: /home/$MYUSERNAME/.local/share/plasma/plasmoids/luisbocanegra.panel.colorizer already exist

STEPS TO REPRODUCE
1. Download a non-stock plasmoid
2. Wait for an update to be put out
3. In the Get New Widgets menu ultimately launched by the global edit, attempt to update the plasmoid
4. Error message will occur

OBSERVED RESULT
It is impossible to update plasmoids without deleting them MANUALLY to reinstall them.

EXPECTED RESULT
Buttons for install, update, etc. will do as they say, deleting or rewriting any files which they need to; asking for privileges, if necessary, or prompting a dialog about which files are being changed.

SOFTWARE/OS VERSIONS
Linux:  Arch on Zen 6.8.2
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version:  6.6.3

ADDITIONAL INFORMATION
I tried to fill out Platform, Severity, and OS, but those drop down menus are actually not appearing.. but that's for a whole different bug report, I suppose.