If you're actually looking to play Winning Eleven 2015 legally, the official versions exist for PS3, Xbox 360, and PC. For PS2, I'd recommend checking legitimate second-hand game stores for original Winning Eleven 2013 or 2014 discs and then researching community patch forums (like Evo-Web or PES Patch) for season updates — those are usually legal modifications of games you already own.
At first glance, the title sounds like a contradiction. The PS2's commercial lifespan ended long before 2015. However, for the initiated, "Winning Eleven 2015" represents the pinnacle of the fan-made patch scene. This article serves as your definitive encyclopedia for understanding, finding, and playing this elusive ISO. i--- Winning Eleven 2015 Ps2 Iso