This is exactly what happened to me. When I first unzipped the new CAI, it put the whole entire folder into my data folder and the original desc_campaign_ai_db.xml remained unchanged. So I think your data folder is set to read only mode, which will prevent the files within it from being replaced.
Right click on your data folder, go to properties and make sure the box that says "Read-only" is unchecked. Then delete the "NEW CAI for Europa barbarorum Test, 30 aug 2014" folder that is inside of your data folder, and try unzipping again.
If you're paranoid like I am you can extract the folder onto the desktop and then copy and paste the files into your data folder.
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