If your drive is unlocked and you have a way of connecting it to your computer via USB, you could just drag and drop all the files from the .zip update (except for the DISCINFO.txt file) to the partition with most of the data on it (not sure of the name but mine has 16.2 gb of data on it). The location you want to drop these files into (and replace the existing files with the new ones) is /AV/CDDB.
Worked for me and saves you a CD.
Thanks CI0! I was wondering if that was possible.