Go to Device Manager, uninstall all instances of "Hornet SongKey" (check "Delete driver software"). Reboot, then run the official installer again.
The v4.0.3 update introduced several critical quality-of-life improvements:
: A major addition that allows users to detect keys from MIDI tracks or export detected chords directly to a DAW's piano roll. Standalone Application
Many users ignore updates, operating under the mantra, "If it ain't broke, don't fix it." With the SongKey MK4, this is a dangerous mindset. Here is why the latest UPD is essential: