If you manage to bypass the activation, ensure your system meets these official requirements : : 8 GB free hard disk space. Graphics : NVIDIA GeForce 7900 or ATI Radeon HD 2600. DirectX : Version 9.0c.
Sometimes the game "forgets" it is activated. Advanced users occasionally use registry files to manually inject the serial key into the Windows Registry at HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\KONAMI\PES2011 . pes 2011 serial unlock request code
Ideally, you would visit an official activation website (often hosted by SecuROM or Konami) to input your Serial and Request Code to get the final Unlock Code. If you manage to bypass the activation, ensure
Look for releases by FitGirl Repacks (highly compressed), R.G. Mechanics , or PES New Era . These repacks are pre-activated and require no serial number at all. Just download, install, and play. Sometimes the game "forgets" it is activated
These are almost universally: