There are a few steps required before running a silent installation:
1. Run setup.exe --record=1
This will run the setup without installing the software and it will record the serial number and the rest of the settings chosen, plus, it will create "Adobe Captivate 4.install.xml" and "Adobe Captivate 4.remove.xml" files in the "C:\Program Files\Common Files\Adobe\Installers" folder. Copy the above two newly created files in the same folder where the setup.exe is and rename them to install.xml and remove.xml respectively.
2. Create a file named "application.xml.override" in the "\payloads\AdobeCaptivate4en_US" folder. Paste the following contents in this file: