Currently (April 2024), the minimum recommended version of QuarkXPress to use with the XV4 64-bit version of Q++Studio is QuarkXPress 2018 (with the 64-bit version of Windows 10 or Windows 11), which has all the advantages of the excellent 2017 version, but also handles large font families with multiple font styles, in particular as it will allow you to select print-only fonts using the new font list editor.