Hi I had this problem last night, you need to remove the old HALion 5 profile from Komplete Kontrol, find it in Users/YOUR NAME/Documents/Native Instruments/Content or something like that (sorry not on my Audio PC).
Then recreate a new profile for HALion 6.
It’s not that you lose the licence as all the content is still in Version 6 it’s just that due to licence changes the VST HALion 5.dll has been removed. So Komplete Kontrol can’t find it.
In Cubase, and I pesume other DAWs, any old project that had version 5, automatically (and don’t quite know how they did this) gets upgraded to the version 6 .dll.
This does not work in Komplete Kontrol, due to the weird way it works. It may be possible to do something similar for old Projects that had Halion 5 in the Komplete Kontrol wrapper, by editing the old profile as described above to point to the new .dll but I’ve not had time to test this.
That’s a weekend job… Hope that helps.