This document explians steps to get web-deploy standalone installer (DMG) from head-end deployement package (PKG)
Step 1:
Download the Head-end deployment (PKG)
Step 2:
Rename the downloaded pkg to .zip
Step 3:
Extract the zip file and navigate to the binaries folder and expand it. There you will find the web deploy dmg
Step 4:
Copy this to your desktop and double click the dmg to mount it. In the mounted dmg you will find the pkg which you can then deploy
Once installed this will only install the vpn client