From the KDE Connect download Web Page, for an Intel macOS you could try to install this .dmg file –
<https://origin.cdn.kde.org/ci-builds/network/kdeconnect-kde/master/macos-x86_64/>
<https://origin.cdn.kde.org/ci-builds/network/kdeconnect-kde/master/macos-x86_64/kdeconnect-kde-master-5273-macos-clang-x86_64.dmg>
This one –
<https://origin.cdn.kde.org/ci-builds/network/kdeconnect-kde/master/macos-arm64/>
is for ARM (M2/M3/M4) Macs only.
In my case, I’ll try removing the Apple Store version and, installing the version from the KDE site – I have a sneaky suspicion that, the version at the Apple Store may be having issues with the newest Sequoia version … 