Galaxy, Novae, Nebulous are addons made by Mustard. I think you should rename the thread "Mustard", it will be
even better to open a new thread in the right section since these addons are not Dan's ones.
The Shuttle Fleet you are searching is the one made by David413 but as many time on the past, the shuttle are once
again not available from orbithangar (removed by the author?).
In my opinion, you can use the default Atlantis shuttle to launch the addon (I assume you can do the scenario change
yourself, if not you will have to read the documentation).