The original Kitserver 13.4.0.0 was compiled using older C++ runtimes and memory addressing that modern Windows OS dislikes. Furthermore, many users download cracked or repacked versions of PES 2013 that have modified .exe files. Kitserver 13.4.0.0 is extremely sensitive to the game’s executable checksum. If the checksum doesn’t match the original pes2013.exe (version 1.04), Kitserver refuses to inject.