Is there any way for our users to select only a sub-set of the available updates? At this point, our user may want updates only for previous releases, and not all that are available.
I'm not quite sure what you mean by that. As the AutomaitcUpdater is right now a user can only update to the latest version of your software that you release.
Also, the default design of the AutomaticUpdater is to automatically download and install updates. Why aren't you using that behavior?