I have Pianoverse installed as well as the 6 current pianos. Occasionally, I'll launch the plugin within Studio One (my DAW of choice), and the instrument shows up empty. No presets, no pianos, nothing.
To restore them, I have to remove the plugin from S1, launch IK Product Manager, then re-insert the Pianoverse plugin, and everything is as normal. I've tried this in Reason 12, and the same thing happens.