I think I found the download here: https://github.com/supercollider/sc3-plugins
Is there a place that the folder needs to be in order for Supercollider to access it, because I’m still seeing the errors.
In Scide, in File menu, click “Open user support directory”. In the folder that opens, create an Extensions subfolder if it doesn’t exist already. That is where my plugins are installed.
To make sure that supercollider finds your plugins, just after installing the plugins be sure to quit scide and restart it (this is needed only once).