All those games probably been zipped by different persons. If one person have a version lower or equal to yours then there is no problem, but if the one who zipped the second part of the serie had a higher version then it's probably why you can't unzip it.
I just downloaded the game and unzipped it without problem. I continue to think you should update your program/drivers to a more current version. I myself use WinAce 2.11 for .zip and WinRar 3.42 for .rar.
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