This problem applies to Revoice Pro Link, VocAlign Ultra, VocAlign Project 5, as well as older products, VocALign Pro and VocALign Project 3 in Logic Pro X.
ARA plug-ins have to be the FIRST plug-in added to the track insert menu.
If there is already a plug-in in the track
You will only see the real-time version of the plug-in
So make sure the AU(ARA) VocAlign (Ultra or Project 5) is the FIRST plug-in and then you should be able to select it as shown below.