Please download manually (NOT with the itch.io client) from www.cs2d.com/download
This should work fine with all major browsers, including Chrome.
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Are you using a download managers or some other special software for downloading? In that case I recommend to try it with a normal browser or to use another browser if you're already using a browser. Otherwise please let me know what exactly you try and what happens (any error messages or something?) so I can try to help you!
That's weird. I already got a report from someone else with the same problem but I don't understand it because the file is in the archive for the mac download. To fix it you can try to download the windows zip archive and extract it into your CS2D folder on your mac. This should add all required files.
Just click the download link specified on the itch page, or here: http://www.cs2d.com/download
If you need the windows setup you can get it here directly: http://www.unrealsoftware.de/get.php?get=cs2d_1003_setup.exe
Hope that helps. Otherwise please let me know what you need.