Hi All. I've forked this plugin and web searched my way through getting NUT 2.8.0 and net-snmp 5.9.3 working.
I AM NOT A DEVELOPER. USE THIS AT YOUR OWN RISK. I don't even know how to use Git efficiently.
https://github.com/autumnwalker/NUT-unRAID
If you want to install this - open Unraid, navigate to Plugins, click the "install plugin" tab and paste the following URL into the URL field (next to "install") button, then click "install".
https://raw.githubusercontent.com/autumnwalker/NUT-unRAID/master/plugin/nut.plg
If this works for you then I'm glad. If it doesn't work I probably cannot help you. It took me all day to get this working based on what I was reading in the thread here and cobbling things through google-fu.
If anyone wants to take this and "make it right" or validate what I have done please feel free to provide feedback. I'm sure there are better or more efficient ways to do what I've done with the code.