As Citrix has updated the Public Store Apps as well as the MDX, I also upgraded my script that upgrade MDX.
This script will automatically update all your Citrix Secure Apps MDX with the latest version 10.7.20.
This script and all my other scripts can be downloaded from the Script tab in the main Menu.
For more information on how it works, check this article:
Note: The script will is designed to only upgrade iOS and Android MDX.