Comentario oficial
It requires the new PLUS library, which is only an issue if you currently use the SYNC MANAGER as you need to select the PLUS library export at the top right. This will be addressed in the next release of rekordbox - unfortunately it was not able to be corrected in time for release, but if you use a regular export all other functions occur in parallel so you don't need to worry about compatibility. Changes made to one library can be updated to your collection and then reflected in the other library.