As WinBox 4 is based on QT, which no longer supports Windows Server 2016, Windows 10 LTSB 2016, and Windows 10 version 1607, these platforms are not compatible with WinBox 4.
It supports Windows 10 (version 1809 or later) x86_64, Windows 11, and Windows on ARM.
Unfortunately, Windows Server 2016 is not supported and will not be supported by WinBox 4.