Hi,
Were they already in there?
No not unless Arturia have changed something.
Or how do I know I have them installed, there is no section in the library called "Latin Vibes" or whatever. I installed to the default location.
So just not sure any of them installed. How do I know?
They are seen as the preset/ kit names. So if you open Spark2 on the Library/ Project page, then you can see the installed exspansions. And when you select a Bank in Spark2 (in example the Latin Vibes Exspansion Pack), then you can see the preset/ kit names, that they also are stored under in the factory folder.
You can see in the storage folders change dates info, to determine when they was installed-