Please remember that there are always
two levels to any computer software problem ...
First, you must make a high-level identification of exactly how to go about solving
your problem. In my case, seeing that you had a "cross-platform" requirement for "monitoring software," I recommended Nagios as an existing solution infrastructure.
Second, you must

figure out whatever
short-term obstacles, such as packages or what-not, may be discovered to be standing in your way.
Perservere ...
Once you have, in the
long view, determined "where your arrows must ultimately go," the
short-term obstacles (like packages and so on...) are merely annoyances. [u]If/u](!!) you have first confirmed that your desired Windows monitoring software
can, in fact, "talk to Nagios," then you can patiently push through all of those annoyances and know that you'll finally have solved the big-picture problem ... for good.
"Linux ... Windows ... OS/X ... IBM big-iron ...
whatever ..." it's really all the same.