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 Tahoe/Retina 2019/2.4 GHz/Intel Core i9/32GB RAM/Radeon Pro 5500M 4GB/
//MSI AMD Ryzen AI 9/2.5GHz/32GB/Nvidia RTX 5070 Ti/Windows 11 Pro
//ArchiCAD Collaborate