In the Local designs gallery you will see folders for first look, components etc these mirror the folders in the content catalogue (except for the stock images and stock illustrations folders for those with DP) When you download something from the content catalogue this is where your downloads get stored. As has been mentioned you can right click on the folders and download all this will do a bulk download of all the content in that folder in the CC. Some of the template folders and particularly the websites will take some time.
The beauty of this is that once downloaded all this content is on your hard drive and you no longer need an internet connection to access it
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