This install is in the current workdir.
IBKR Desktop uses Qt Jambi and is sensitive to the native Qt version it loads.
The app's bundled Qt was 6.8.3, but at one point some files in lib/qt/lib/
and lib/qt/plugins/platforms/ were replaced with Arch system Qt 6.11 pieces.
That caused the launcher to fail early with a Qt Jambi native mismatch.