Download your chosen CPK stadium pack (often found on community sites like EvoWeb) and extract the .cpk files.
Unlike the older "Stadium Server" methods that required external executables, CPK files are the "native" language of PES 2021. Once installed correctly, the game reads them as if they were official DLC. Stadium Pack Pes 2021 Cpk
: Updated day and night variations to simulate real-world match atmospheres. Download your chosen CPK stadium pack (often found