You need to install the agent on these systems. After that is installed, you need to install VSE880.
As far as being on the same network, I am unsure how you can get them to communicate, possibly some sort of NAT solution. You could probably push the agent to them via SCCM, but I am not sure if using a 3rd party tool is supported.
where can I download full installation version VSE880 from?
I found zip file named VSE880LMLRP1.Zip which seem to contain what I need on my local server but would prefer to have trusted version from McAfee - where can I find it ?