One would assume that you have copies of both cdrwin and ppf-o-matic. When you download the patch, unzip it, and you will find a series of files. Files ending in .ppf are the patch files, the other files are often info files. Double click on these to see if they have anything to say. If there are multiple .ppf files, they will have the same names, but end in different numbers. i.e. 1-4. this last number corresponds to disc number. So if there are multiple .ppf files, then yes you will have to patch each disc.
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