The changelog for version 13.4.0.0 is concise but critical:
If you encounter issues, here are the most common solutions: Kitserver 13 1.04
Kitserver 13 is an add-on program developed by legendary modders Juce and Robbie for Pro Evolution Soccer 2013. Version 1.04 is one of the definitive updates for this tool, specifically engineered to ensure compatibility with the official PES 2013 executable (EXE) version 1.04 and Data Pack (DLC) 6.00. The changelog for version 13