He had to "patch" the original ISO file. He used a program called DKZ Studio, a temperamental piece of software that felt like defusing a bomb. He imported the new textures: high-definition grass, realistic faces for wonderkids who were barely toddlers when the game launched, and, most importantly, the updated chants.
is currently considered the "gold standard" for the 2024/25 season?
Using a clunky tool like DKZ Studio to "inject" the new textures, updated rosters, and—most importantly—the chant packs.
The patcher will tell you "Patch applied successfully." Your ISO size might change slightly, but it should remain around 4.3GB.