The documentation detailing how to install the BigFix Client on Windows was aggregated and updated.
Here are the new links in case someone is looking for them.
Installing the Client using the .exe setup
https://help.hcltechsw.com/bigfix/10.0/platform/Platform/Installation/c_installing_client_setup_exe.html
https://help.hcltechsw.com/bigfix/9.5/platform/Platform/Installation/c_installing_client_setup_exe.html
Installing the Client using the .msi setup
https://help.hcltechsw.com/bigfix/10.0/platform/Platform/Installation/c_installing_client_setup_msi.html
https://help.hcltechsw.com/bigfix/9.5/platform/Platform/Installation/c_installing_client_setup_msi.html
Both pages include instructions on how to install the BigFix agent silently on Windows via the command line.