The launcher will scan your files and download any newly updated map tiles directly from official servers.
Right-click X-Plane 11 in your library > Properties > DLC. Check the boxes for the continents you want. Steam will automatically download the most "updated" files.
X-Plane 11 is frequently updated (up to version 11.55). Older "CODEX" repacks are often stuck on version 11.00, meaning they won't work with modern plugins like Zibo 737 or Vulkan rendering.
The is a massive world-map expansion designed to replace the limited scenery of the base game (which typically only includes the Seattle area by default) with high-definition terrain for the entire planet. Core Content & Regions