They're all still there, Shae... The access to the correct page for your localized version is, as it always has been, via the Help Menu > ArchiCAD xx Downloads
(Well, they actually called the link "Goodies" for several versions, but same idea.)
Your US add-ons are here:
http://www.graphisoft.com/support/archicad/downloads/ac13/USA/
The Accessories library (your other post) is part of the Accessories download package.
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB