You're looking for a paper ( likely a guide or a tutorial) on how to install or create a stadium pack for PES 2021, specifically a .cpk file.
Stadium packs for in CPK format remain a popular way to refresh the game's visuals, especially for those using the SP Football Life . Recent releases like Stadium Pack V25 Remake 2026 V31 Season 2026 Stadium Pack Pes 2021 Cpk