Infinite loop when trying to unzip Adobe CS6 downloaded from "Arvato"

The downloaded CS6 file "Download_Package.zip" does not open into a functional file (I tried this with Safari and with Chrome with the same results, all cookies enabled).

Here's what I did:

1.  Buy Adobe CS6 "design and web premium" academic version from my university bookstore, they gave me an Adobe card with a number on it.

2. Go to the website indicated on the card, entered product code on the back of the card

3.  Received email from custserv@identit-e.com a few seconds later, with instructions, which includes the 36 digit "Redemption Code"

4. As instructed in the email message, went to http://www.adobe.com/go/getserial.  This bounces me to the website https://redeem.licenses.adobe.com/getserial/#

5. Inserted Adobe ID and Password where requested.

6.  Entered the redemption code, Made a note of the displayed serial number

7.  Pressed the "Download" button.

8.  The downloaded CS6 file "Download_Package.zip" showed up in my download folder.  It automatically unziped itself to a file called "Download_Package.app" with an icon that reads "Arvato Bertelsmann"

9.  Clicked on the "Arvato Bertelsmann" icon and it opened a window.  Pressed the button "start" and it downloads a 4.53 GB file into a folder called "Package" that contains the  archive file called "Adobe Creative Suite 6 Design & Web Premium MAC.zip".

10.  When I double click on this file, it creates a new file called "Adobe Creative Suite 6 Design & Web Premium MAC.zip.cpgz"

11.  Then when I double click on this file, it just archives itself into a new .zip file.  This then becomes an infinite loop.