This question has been asked quite some time , search for "SSI" (Suite Stack Installer), you'll have a couple of threads, like those ones:
Basically it's easy / fast to install as it's a database restore but installations options are limited (at installations) and all locales are installed.
There are some combinations available (Windows + Oracle, Windows + SQL Server, Linux + Oracle) and it needs a unicode database, but all this is detailed in the threads I gave
So it can be interesting for a POC or a test rig.
With individual installers you control what you install
As for SSI versions, if you look in EPD in "Licensed Products" tab (once logged into EDP), it'll be the 7.6.04 version.
If you look info the "Product Patches" tab, it'll be 7.6.04 sp2 suite
So no it's not the "latest / latest" since ARS 7.6.04 sp3 and atrium core 7.6.04 sp3 are out.
I guess if you want to upgrade to latest SP3 you can install SSI and then run the two upgrades once SSI is installed.
-> I installed SSI 7.6.04 sp2 on a Windows + MS SQL Server (both 2008 r2 sp1 x64 enterprise).
-> Then I upgraded to ARS 7.6.04 sp3 (individual installer).
-> Then I upgraded to cmdb 7.6.04 sp3 (individual installer) (added AIE since it's not installed by SSI),
If you try this though you should know that if you have database on the same VM (as I did since it's a test rig), you'll need 10 GB or RAM for the upgrade part. Even with sql server limited to 4 GB (for me) it jumped in the end of ARS installation to 9.39 GB ram used...