The Core Catalog is the default library content provided by Chief Architecture. Unlike "Bonus Catalogs" (which are often manufacturer-specific or niche styles released periodically) or "User Catalogs" (custom items you create), the Core Catalog contains the fundamentals:
Right-click and choose to download the specific Core Libraries required for your current software version (e.g., Chief Architect Premier X17). download chief architect core catalog
While the automatic method works for most users, you may need to manually download and install the Core Catalog if: The Core Catalog is the default library content