@kusanagi You only need a single zip file! This one:
One zip next to PowerShell script, run the script and that's all.
So that "KOReader and Plato" zip archive actually contains/installs 4 things: NickelMenu, KFMon, KOReader, Plato.
The only reason there is a zip archive containing only KFMon is because after every firmware update you need to reinstall KFMon.