Exacq broke Avigilon support and evidently has not plans to rectify it.
However, now Milestone, with their most recent Device Pack (7.3), lists new support for Avigilon cameras.
We did a quick test. Take a look in this screencast:
This seems like a good competitive move. With Avigilon systems more common than ever, having the ability to fully take over an installation of their cameras without having to use server side VMD makes sense.