files (CRI Middleware Package) as archived containers that house the game’s core assets, including player faces, stadium textures, kits, and database information. Update Structure

This specific .cpk file contains the following major updates:

The file is the primary data file for Data Pack 2.0 (DLC 2.0) in eFootball PES 2021 Season Update

The solution is almost always in the load order. When in doubt, verify your files with Steam and follow your chosen patch's instructions to the letter.

In the PES file structure, .cpk files (CRI Packed File) are compressed archives used to store game assets like textures, 3D models, and database files. The "Dt80" prefix typically denotes official Data Pack (DLC) content. This specific file, roughly in size, contains the bulk of the assets introduced in the second major seasonal update. Key Content in Data Pack 2.0