I also have Novation Impulse 61, and use Automap 4 in Sonar Platinum.
As you may have found, the install has many left turns, curve balls, and perhaps even a few wtfs.
I originally installed it with Sonar X3, then updated to Sonar Platinum version.
While I can say it works in Sonar, I would also qualify that with the fact not everything works as advertised.
First clue, all the tutorial videos are for other DAWs, though it claims they've added support for Sonar, I found the tech support to be lacking in depth knowledge of Sonar.
Hope you get the Sonar configuration part figured out, let us know more details of your issues ?
Did you get the Automap wrapped versions of all your plugins, or did it not get past that ?