The only known conflict is with older mesh replacement packages (like HD Mesh v4). Uninstall those before installing DLCCodex to avoid layering errors.
The Global Scenery provides:
Water world where there should be land, or “Could not locate scenery file” errors. Fix: Run the X‑Plane 11 installer and select “Update scenery” (not just core files). x plane 11 global scenery dlccodex updated
We tested the DLCCodex Updated scenery on a mid-range system (Intel i7-9700K, 32GB RAM, GTX 1080 Ti, 1TB NVMe SSD, X Plane 11.55). The results are telling: The only known conflict is with older mesh