A .cpgz file means the zip file was corrupted — there was a glitch during the download, most likely from a brief interruption in your internet connection.
First thing you'll want to do is delete the .cpgz files so the new files can download correctly.
Make sure you have enough space on your hard drive, and that your download folder doesn't have a space limitation.
Then, re-download the file. If you bought multiple products and are having problems, download them one at a time, not all at once.