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A likely cause for this is that your download aborted early, and so the downloaded .zip file is not complete.
The Ca3DE-7.07.zip file should be exactly 271.558.423 bytes large.
If you instead got the newer Ca3DE-7.12-RC1a.zip from http://www.ca3d-engine.de/forum/viewtop ... 2475#p2475, the file size should be exactly 276.035.982 bytes.
Please try the download again, and possibly use a download manager to make sure that the download completes. The .zip file should then be extractable with any program like WinZip, 7-zip, etc.
Hope that helps.
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