I updated KK to the newest version and now, some of my plugins are missing. All of them show up in NA and are installed, but when I open KK, a lot of them are missing. I have an Apple Mac M2, Logic Pro, OS 13.6
https://support.native-instruments.com/hc/en-us/articles/360000166958-My-Product-is-Missing-in-Native-Access
Try going in here and delete the XML file (step 8) and then refresh Native Access.