NetworkManagerQt is officially a Frameworks now. As a consequence the repository has been renamed from libnm-qt to networkmanager-qt and NMQt version number now follows Frameworks version number (currently 5.8.0).
NMQt 0.9.8.4 is the last release from the 0.9.8.x series. From NMQt 5.8.0 and on you need to install Frameworks instead of downloading it separately.
Bugs fixed in NMQt 0.9.8.4:
. Fix security type check for wireless connections.
. Fix secrets loading for openconnect connections.
339296: Fix vpn secrets loading.
. Update documentation.