Hello,
if I update Kontakt and Battery to the most recent versions via Native Access, both applications present me a dialog with the choices to open the applications in demo mode, activate them using Native Access or to buy the program.
When I open the "about" window after I choose the demo mode, a lot of question marks appear as serial numbers instead of the real serial number. When I open Native Access through the app, the applications appear as installed.
Re-installing the applications does not solve the problem, but in the case of Kontakt it appears as registered again if I downgrade it to 7.10.6 or earlier. Not tried with Battery yet.