for german Mac-users it should be
sudo /Volumes/Vectorworks\ 2018/Vectorworks\ 2018\ installieren.app/Contents/Resources/installer/Install\ Vectorworks2018.app/Contents/MacOS/installbuilder.sh --unattendedmodeui none --mode unattended --Serial BDXGMZ-XXXXXX-XXXXXX-XXXXXX --UserName Benutzer --CompName Firma --installdir /Applications/Vectorworks\ 2018