The extra parameters are a side effect from how max gen works, you can just ignore those parameters.
If they really bother you, edit the main plugin ttl file and set those as OutputPort instead of InputPort.
On the python error on macOS terminal, that is an issue on macOS not having updated certificates.
Because python 2.7 is really, really old.
If you install python3 through homebrew or macports, and tweak the script to use it, it will fix this specific issue.
That said, that script needs update in order to support duox and dwarf.
I thought @acunha already did that, but it was not the case. I have it as a task for myself to do.
And finally, regarding the “trial” plugin, somehow the plugin is being identified to be built as commercial. I don’t know why yet, will investigate.