They added two extra plugs for the RTA versions. Now you will have "F6 mono", "F6 Stereo", "F6 mono RTA", and "F6 stereo RTA".
If you open a previous project that had F6, you will get the original F6 without RTA. You have to save your F6 settings, remove the original F6, add the "F6 RTA" version, then recall your saved settings.