Ensure your base game version matches the PLAZA release requirements. This texture pack is usually designed as an "Update" or "Add-on" for their specific ISO of the game.
It sounds like you’re looking at the release by the group PLAZA . This is a dedicated high-resolution asset pack designed to overhaul the visual fidelity of the game, specifically for 4K displays. What is the HD Texture Pack? FINAL FANTASY XV HD TEXTURE PACK-PLAZA
Because these textures are uncompressed and massive, they are very demanding. To run this smoothly, you generally need: At least 8GB (ideally 11GB+). Ensure your base game version matches the PLAZA
Crisper rocks, foliage, and building surfaces. and building surfaces.