This is due to an incompatibility between Google Chrome and the Java Dowload Agent. The Download Agent is a 64-bit applet whereas Google Chrome is a 32-bit Web Browser. In order to use the Download Agent you will need to use a different browser that is 64-bit (ie- Safari, Firefox, etc.).
Alternatively you may choose to download the files manually instead of using the Download Agent. See the related solution below for manual download instructions.
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