I recently updated my N.I. Komplete from 11 to 13 and really most of the new programs are getting blacklisted (including the 64 bit versions) and even after I reactivate them, I still cannot select them from the add instruments track, as they are not even showing available.
I have Cubase 10.5
no problems with the latest Native instruments plugins I own (Kontakt, fm8, massive, massive X and battery) so I would uninstall and try again making sure I installed the correct versions in the correct paths.
Problems solved didn’t realize that you can drag and drop vsts in the plugin manager. I dragged massive x from the left pane to the appropriate folder in the right pane. Now I feel so organized