You express yourself very well in English, no problems there

It is possible to change the partition ratios, but we need to generate a file that will produce the exact same CRC as is expected by the factory CD, so need special software and hardware dongle. I don't have it at the moment, another forum user has it so will ask him to create the dlscript.txt file that is needed. Then you can insert it into the ISO (and also an edited .WSH file) and have ratios of 70/25/5.