This is just a guess, but it's possible that you have a version to version patch (for example, 1.6 to 1.7 patch) and the game is looking for version 1.6 and not finding it because you have a different version - presumably 1.0, if you just installed it.
Check the patch versions carefuly to see if the patch notes or file name specifies a particular version to patch from. It might be that, if there are no cumulative patches, you need to download multiple patches and go from 1.0 to 101, 1.1 to 1.2, and so on, all the way to 1.7.
You might want to try getting an earlier patch - the first released, if possible - and see if that works. If it does work, get consecutive patches and keep on trying the 1.74 patch with each updated version. It will hopefully take at some point.
Again, this is a guess, but it's a common issue when patching a game.
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