Hello. This plugin is based on Hudell's Cyclone project. I can't make this plugin paid since that would be taking someone else's work, what I did was simply adapt it to be compatible with RPG MAKER MZ and added some plugin commands.
However, I recommend that you use this plugin:
https://rabbitteaparty.itch.io/nekogakuen-steamworksapi
It's a plugin that I personally use, and it extends the capabilities even further than SteamLink.
Best regards!