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Let's start with a standard list of questions:
1). Is the disc **definitely** a licensed copy?
If it's a pirated copy and/or the game was downloaded from the internet, unfortunately, there's nothing we can do to help; the patch cannot be installed.
2). Where did you get the patch from?
It is recommended to download it from official sources, such as a disc from a gaming magazine, etc. In other cases, there is a possibility of a broken link or the patch itself being damaged and not installing correctly.
3). Is it possible to send a screenshot of the problem?
If the first two points are in order, a screenshot will simplify the problem-solving process.
* By the word "definitely," we mean that it is indeed a licensed copy, and not just seems like it, possibly, maybe, or as if/given by Santa Claus/or a one-legged vendor with a hook swore on a bottle of Hawaiian rum that the disc is licensed.