We wrote the installation ( and the Livery Manager ) for them, and it uses the very latest Addon Manager, and it also has the same online update feature of our own installer so, regardless if you install our Addon Manager or the QW757, you will get exactly the same version of the Addon Manager, which is always current, because both will be fetched "live" from the same place, when the installation starts.
If you have the Stand-alone Addon Manager installer, if you just run it, it will update your Addon Manager and, the same will happen if you need to reinstall any scenery for any reason.