You installed it from some package source that handles upgrades differently. You should figure out how, uninstall it that way, then install it some manner with upgrades that you prefer. Homebrew is fine. Our GitHub releases are fine.
Thanks.
If I uninstall it and then install the from the Github zip (syncthing-macos-universal-v1.23.5) is there a way I can retail the six folders synced with my Android phone, or do I have to recreate each one and sync them again?