I downloaded the "Install a Windows Secondary Hub or install in a DMZ" from the UIM home page of 20.4.8.
While installing it for a tunnel client with custom installation or DMZ installation, the DMZ is showing 0kb during the installation, and it is not being installed.
UIM primary upgraded to 20.4 CU8
Tunnel Servers 20.4.8
This is a known defect in the UIM 20.4.CU8 Secondary HUB installer, where the DMZ is missing.
The issue has been resolved in the latest UIM release version 23.4.