New Native Access and Kontakt 7 player updated and installed but missing samples in old projects

Hi there, I’m wondering if someone can help. I was not able to load hybrid keys and a few others without updating my Kontakt 7 player, so I updated this and the installed the new native access update as well so these could work. These now function again in new projects, however many old projects I open now do not play sound as there are missing samples (see images below). I cannot locate where these are, and I don’t know if I need to do a batch reset or something else to find these again. I’m quite frustrated as everything was functioning well before I had to update Kontakt player to version 7.8 to open certain plugins. (Extra info- I only have Kontakt 6 as I have not bought Kontakt 7)

Any help is massively appreciated, Thanks