Sounds like you need to copy the KP5 VST plugin file into the Avid VST folder.
Copy the file "Kontakt 5.dll" from (assuming 64-bit):
C:\Program Files\Native Instruments\VSTPlugins 64 bit
Paste to:
C:\Program Files\Avid\VSTPlugins
Let me know if that gets it.
Copy the file "Kontakt 5.dll" from (assuming 64-bit):
C:\Program Files\Native Instruments\VSTPlugins 64 bit
Paste to:
C:\Program Files\Avid\VSTPlugins
Let me know if that gets it.