City Sample Crowds has now been added to FAB:
https://www.fab.com/listings/903037e9-e1ac-4f41-96e8-1683c6fa7ad4
I, fortunately, never got round to figuring out the migration of CitySampleCrowd from the big CitySample scene to a fresh empty project.
Next question, @Epic:
Is City Sample Crowds 5.4 / 5.5 support in the pipeline?
Or is this system to be dropped from active dev?