Backup Files (.kdc) can be used to back up and restore the entire Contents pane.
Please see the Using Khan Desktop/Update Tab topic in the Help File for more information and instructions.
Below are a few of these .kdc files which you can download and install.
Note the files are about 1/5 the size of the current KA contents update.
Simply click on a file to download it to your computer. Then, from the Khan Desktop Update tab, use the Restore button to install it.
This Feburary 15, 2019 Contents file has been modified by deleting the kMAP topic which is apparently a list used by KA for something in development, and by deleting a bunch of math topics which are apparently specialized curriculum for KA clients. If something important has been deleted by mistake let me know.
The full KA downloaded contents from Feburary 15, 2019.
Contents from November 3, 2017.
Contents from September 14, 2017.