Not sure what you mean by "upload" (possibly
into Archicad?), but none of the files will give you what you need. Those are just some kind of "extensions" to the shape file.
I saw that the platform also gives you the DEM data in some places, that's possibly what you're after.
There is a button to download a .csv, where I first thought you could import that directly with the mesh importer in Archicad, but the .csv just seems to be filled with a link where you download the actual data (?). I'm a bit confused in that regard.