xdelta UI XD3_INVALID_INPUT

[ScottishGolden]

So I've been trying to add a mod to my ISO copy of Gran Turismo 4 which is the randomizer mod and I keep getting the Invalid input error and I'm starting to get a little pissed off. I have no clue how to resolve the issue and I saw in the twitter post comments that you apparently need a specific ISO and nobody has a link to it or said where to find it.
The way the error was wrote was:
xdelta3: target window checksum mismatch XD3_INVALID_INPUT
I don't know how to disable the checksum.