See the various SC help files, in particular for the VSTPlugin and VSTPluginController classes.
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The Supernova version of VSTPlugin only works on SuperCollider 3.11 and above!
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macOS: the VST GUI only works on SuperCollider 3.11 and above! Otherwise you get a warning if you try to open a plugin with "editor: true".
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Existing SynthDef files written with v0.4 or below don't work in v0.5, because the UGen structure has changed; you have to recreate them with the new version.
If you want to port the VSTPlugin UGen to a third-party client, have a look at the UGen command reference