I have played this in the past and its awesome. I saw there was a new version so I decided to download it but when I open the zip file I keep getting this message: 'helms_dr20.vpk' is not a valid Source engine add-on. Installation failed. Any idea of what is going on and how I can fix it? I have tried several times to download it and keep getting the same message.
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This review was posted before the latest release.