I mean in which directory.
Anywhere You want.
After starting Archicad simply use Library manager and load this folder.
Archicad could use numerous folders, objects or archive files (pla, lcf).
Best
Rafał
//Archicad since 4.1 version
//MacBook Pro Retina 2019/2.4 GHz/Intel Core i9/32GB RAM/Radeon Pro 5500M 4GB/macOS 13.6
//Razer Intel i9/2.5GHz/32GB/Nvidia RTX 3080/Windows 11 Pro
//ArchiCAD 28/Twinmotion 2024