I'm running Mojave (macOS 10.14.6) and I didn't have a ~/Library/Application Support/QtProject/Qt Creator/plugins/ directory. Creating it and copying the plugin had no effect.
However, I was able to install the plugin (with the same issues as #1 though) by copying it directly inside the app apckage: QtCreator.app/Contents/Plugins/.
I'm running Mojave (macOS 10.14.6) and I didn't have a
~/Library/Application Support/QtProject/Qt Creator/plugins/
directory. Creating it and copying the plugin had no effect.However, I was able to install the plugin (with the same issues as #1 though) by copying it directly inside the app apckage:
QtCreator.app/Contents/Plugins/
.