There is a way to make it fits in 1 DVD5. The same method used with
Phantasy Star Universe.
First you need this applications:
Inno Unpacker 019 (Command version, not GUI)
Inno Setup Compiler Inno Setup Compiler
Well, now extract your ISO to a folder.
Extract Inno Unpacker into the same folder you extract your ISO.
Open Command Line (MS-DOS or whatever you called it) and go to the path the ISO is. Type
innounp setup.exe -dFOLDER -x where FOLDER means the destination folde you want to extract all datas. Use a different folder or subfolder, do not use the same you extract the ISO so you have not files crossing.
Once extracted explore that folder looking for
install_script.iss. Open that file with
Inno Setup Compiler and modified it this way:
Modify:
Compression=lzma/ultra (modified from none to lzma/ultra)
Add:
DiskSpanning=yes
SlicesPerDisk=3
DiskSliceSize=2100000000
Now you can press
CTRL + F9 (or use menu Build --> Compile)
If application tells you there is some errors go to that line and delete it (I had to delete one line and Language = "AE"; from another). Then Compile again.
Once compilation started you only have to wait until compilation is done. A folder named
Output will content the cabs you need and setup.exe. Change this with the original ones and here you got a ISO with 4.28 Gbs approximately.
Sorry about my english.
I hope this will help you.
Cheers.
Refi.