Installing a Symantec Endpoint Protection (SEP) client with the "forced restart" installation setting applied does not force a system restart once the installation is complete.
Not all features of the SEP product require a reboot post installation. The forced restart setting behavior is dependent on the feature set(s) being installed.
If the SEP client installation package includes a feature set that requires a reboot to complete the installation process, then the forced restart setting will be honored. If the installation does not require a reboot to complete then one will not be initiated.
Symantec Endpoint Protection 12.1