You cannot download a file, put it on a USB drive, and install a custom armor skin, weapon model, or gameplay tweak on a standard PlayStation 4.
To install mods on your PS4, you'll need: Monster Hunter World Iceborne Ps4 Mods
For PS4 players, "modding" Monster Hunter World: Iceborne is less about custom content and more about . It offers a way to bypass the RNG grind for decorations and cosmetics, but it comes with the significant risk of a ban or corrupted data. You cannot download a file, put it on