Hi docouto19 i got some instructions for modifying the reserved space in Game Graphic Studio.
1. Rename cv_0.img as e.g. cv_0.img(old) in the PES2008 directory. Then open it with GGS.
2. When you have opened it right click on any of the files, then choose modify reserved space then a new box will appear.
3. In the 2nd box a black dot will be selected on the 1st dot click the dot below it then put in the 2 squares at the side of it put in the first 1409 and in the other 2325.
4. Then in the 3rd box click reserve and put in the box (look in the read me file in the download instructions and you might see something like
e.g. "maximising it to 96256 bytes" then what ever the number is type that in the box.
5. In the first box is where you want to save it in you need to save it in
C:\Program Files\KONAMI\Pro Evolution Soccer 2008\img and call it cv_0.img(new) but remember to save the old one that you called
cv_0.img(old) DONT save your old in C:\Program Files\KONAMI\Pro Evolution Soccer 2008\img save it in my docs or something(if I were you I would make a back up folder for pes2008 and save cv_0.img(old) in there.
6.Then click proceed then wait for it to make it then when its done a box will appear saying open new AFS file and click no. Then go to C:\Program Files\KONAMI\Pro Evolution Soccer 2008\img then drag cv_0.img(old) to a backup folder as I said earlier then call cv_0.img(new) as the old one cv_0.img. Then your done hope this helps