Instructions
Using Max Drive to Install the Option File
Download the Option File of your choosing and place it on the desktop.
Connect and install (if you haven't done so already) the Max Drive to your computer. Wait for it to be detected.
Right-click the Option File, select "Send To" and select "Max Drive". By default, Max Drive is the F drive.
Disconnect the Max Drive from your computer. Plug it into your PS2's USB port.
Launch Max Drive in the PS2. Use the PlayStation browser to verify that your Option File is indeed in Max Drive.
Insert a memory card into the PS2. Make sure that it has enough space to hold the Option File you want to install.
Highlight the Option File and select "Uncrush to memory card". Start PES 2008 like normal. Your Option File is now readily accessible.