Do not extract to Desktop or Downloads. Go to your PES 2011 installation directory. Example for Steam or cracked versions:
C:\Program Files (x86)\KONAMI\Pro Evolution Soccer 2011\
In this folder, you should see PES2011.exe, settings.exe, and folders like img and save. Extract the Kitserver folder here so that the path looks like:
...\PES 2011\kitserver\
Open config.txt inside the Kitserver folder. You can edit lines to: Kitserver Pes 2011 Pc Download
Inside the kitserver folder, locate manager.exe.
Download & Integrity Check
Module Toggle UI
One-Click Install
Uninstall / Rollback