Hello,
You can download and install NAC installation over SEP Manager installation.
Or you can just copy snac.xml file on NAC installation files to C:\Program Files\Symantec\Symantec Endpoint Protection Manager\Tomcat\etc\license folder.
After restarting Symantec Endpoint Protection Manager from services.msc then you can see Host Integrity tab visible under the Policies on Sep Manager.
Regards,
Oykun