Save the .dmg image
Eject the mounted disk image and convert it back to a read-only format.
diskutil eject /Volumes/Cisco\\ Secure\\ Client\\ <version>
hdiutil convert csc-writeable.dmg -format UDRO -o csc-readable.dmg
The resulting file (csc-readable.dmg) can be distributed to users for manual installation or used as part of the Automated Installation process.