Fatal error: The host address does not match the referer host address
This error occurres if your web browser does not send the referer host address. Many anonymizer or browser tools (e.g. the Google toolbar) provide an option to hide the referer address to prevent user tracking. Find the culprit on your local computer and disable the feature.
Last update on September 21st, 2009 by Leo Feyer.

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Comment by Mark Swenson |
I encountered this problem and was quite frustrated with it until I realized that the problem was SSL. I had setup the administration module to be forced to run on SSL and SSL strips referrer information. If you encounter this problem that might be a reason why. In my case I just had to rename the .htaccess file that forces SSL, then do the update, and then change the .htaccess file back.