This script will download all the maps for the CID insurgency servers.
The map pack is given here:
http://www.cidclan.net/showthread.php?13549-Insurgency-CiD-Map-Pack
And the servers are found here:
Download the script below and execute:
wget https://gist.githubusercontent.com/skulumani/1f1b88ec65f365a6b4d619530dfed9a5/raw/4e4e9c047449d3bf0c1aa9e5716a7a5f0b8da8d0/insurgency_cid_download.sh
bash ./insurgency_cid_download.sh
This will prompt you for the path to your Steam install of Insurgency. The script will then download all the maps, extract the files, and copy them to the appropriate directory.
Tested on XUbuntu 18.04