You cannot legally download this game as a standalone PC file. However, Sony has made it available via the PlayStation Plus Premium tier (Classics Catalog). If you own a PS4 or PS5, you can stream or download the original PS2 version directly from Sony. This is the safest, cleanest way to play.
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Just don't expect the "Season Mode" to make sense. It involves walking through a hallway to select matches, and the dialogue is... something else. You cannot legally download this game as a