Standalone is also a problem, so that's what I'm troubleshooting with.K8 ver 8.8.0 here. Never an issue.
Did you relocate anything.
As a failsafe. Run Kontakt 8 as standalone. It will look for any or all related files in your library. Also run Komplete Kontrol as standalone. This will also update.
Then update your plugin manager in Studio Pro. All simple and quick fixes. Should iron things out for you.