The unatttended install command is documented here:
https://techdocs.broadcom.com/us/en/ca-enterprise-software/devops/test-data-management/4-9/installing/install-test-data-manager/install-tdm-portal-for-windows.html
How to specify an alternate location to the default of C:\Program Files\CA\CA Test Data Manager Portal
Release : 4.9
Component : CA Test Data Manager
1) Add the APPDIR property to the commandline to change the target location of the software.
For example:
APPDIR="D:\Program Files\CA\CA Test Data Manager Portal"
2) To change the default C:\ProgramData\CA\CA Test Data Manager Portal:
Set the CATDMWEB_APPDATA as an environment variable before running the installer.