Hi,
please note that installation guides are in installation package too.
By the way, once you have download the full package for SNAC:
0) remember to take proper back-up's
1) run the setup.exe
2) select to install the Manager
3) the installer will detect that SEPM is there and it will add only the differences
4) if everything is OK, in Policies you should see a new category for Host Integrity
5) nothing needs to be done on the SEP clients, SNAC will get enabled as soon as they get the license from the SEPM.
That's all.