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?

Be prepared for a massive file size—this pack usually adds around 50GB to 60GB to the base game's install size. Installation Notes (PLAZA Release)

Run the provided installer and point it to your main Final Fantasy XV installation folder.

If you experience "stuttering" after installing this, it is likely because your GPU is running out of Video RAM. If that happens, try lowering the setting in the options menu from "Highest" to "High" while keeping the HD pack active.

While it works at 1080p, the difference is most noticeable at 4K (2160p) .

Because these textures are uncompressed and massive, they are very demanding. To run this smoothly, you generally need: At least 8GB (ideally 11GB+).