IIRC, just installing Shuttle Fleet will only get you the orbiters and a few scenarios. I don't remember it having any extra launch tower.
If you want to expand it, David413 also has the ISS Fleet (can also be found at simviation) but you'll need to be able to manipulate scenario files to do anything beyond what is included in the package.
If you are wanting a dynamic ISS, you'll need the ISS 3.2 [ame="https://www.orbithangar.com/searchid.php?ID=3737"]Just a moment...[/ame]
It does have a full launch tower (along with quite a lot of build missions) and it uses the Shuttle Fleet and adds to it (Max-Q effect and contrails during reentry among other things). To continue ISS construction you'll also need ISS A to Z [ame="https://www.orbithangar.com/searchid.php?ID=5633"]Just a moment...[/ame]