If you see the error:
VocAlign Project could not do
this because...
There is no selected Guide ... (8003)
you may be using an older Logic Pro version that does not support ARA operation.
The ARA version of the plugin may open, but you will not be able to capture your Guide.
VocAlign Project 5 and VocAlign Ultra ARA support requires Logic Pro version 10.6.1 or later.
With older versions of Logic Pro, you can capture your audio using the AU version of the plugin, as documented in the VocAlign Project 5 User Guide, in this section: Using the real-time AU version of VocAlign Project 5 in Logic Pro X