Well, there are a few possibilities:
1. You've got the wrong patch. Perhaps you have the english version and downloaded the patch for the french version.
2. Maybe it isn't a cumulative patch, which means you have to upgrade it to 1.1 first.
3. If you have an illegal version (i.e. cracked) the sierra.exe is changed to get rid of the copy-protection which means the patch doesn't recognize your sierra.exe
4. Or you have applied a no-cd patch to the game, which again means your sierra.exe is
not recognized.
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