Hello Mike,
There is always difference in installing the software manual and using the Switches. To test the Software installation using the Switches, copy all the required installation files to one folder and from the command prompt, change the directory to folder then call the installation files using the Switches.
Example : C:\Software\setup.exe /S
BTW: From google, I got the below document to install the SAP GUI.
Looking forward to assist you,
-----
Dinesh Babu J
Sr.Technical Consultant
Desktop and Mobile Device Management Solution
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