Just bought Komplete26 upgrade from 11 and in Logic Pro when I load in Massive X I just get the player version
Have you tried to reinstall Massive X in Native Access?
Also make sure to givs full disk access to Logic, Native Access and all your NI apps: https://support.native-instruments.com/support/solutions/articles/69000880000-how-to-enable-full-disk-access-on-macos