If you had installed a previous patch version, it is recommended to delete the 'FileLoader' folder inside the PES 2014 install directory before installing the newer version.
You need to download all part files, then unrar the first part (ends with 'part1.rar'). Start the Installer.exe as admin.
Remove 'FileLoader' folder inside PES 2014 install directory (if you installed custom files using FileLoader, you can backup the folder by moving it somewhere else.)
Download PES 2014 Data Pack 2 via the link provided in the PESEdit.com 2014 Patch thread.
Copy the included 'dt50_001.cpk' (Data Pack 1) and 'dt500_7999999.cpk' (Data Pack 2) files to