ARA operation requires Logic Pro X 10.5.1.
Previous versions of Logic Pro X - including 10.4.x - do not support ARA operation.
We recommend Logic Pro X 10.6.1 or higher, as ARA operation is more reliable.
AU (ARA) support in Logic Pro was introduced with VocAlign Pro Audio Units 4.4.1.1 and VocAlign Project Audio Units 3.5.1.1
Previous versions of VocALign Pro and VocALign Project do not offer ARA operation.
All versions of VocAlign Ultra and VocAlign Project 5 support ARA with Logic 10.5.1 and higher.
(We recommend Logic Pro X 10.6.1 or higher, as ARA operation is more reliable.)
The latest VocAlign installers are always available from your Plugins page (VocAlign Project 5 / Ultra, or newer) or the Legacy Installers page.