Without knowing the content of the message, I can't be sure. But I'm guessing that what you saw was not an error message, but a warning, to the effect that the patcher was about to change the size of the file being patched. If so, this is a standard warning with TDW's patcher and doesn't indicate that there is anything wrong. At that point, just click "Continue" (or whatever) and proceed with the patch installation.
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