The read me in that newport zip file is missing/misleading
I installed dosbox and extracted the zip to /root/DOSBox-Win31-Newport under a Ubuntu setup I edited the STOCK.NPT to the current date (2348518) which I obtained via the other download link (downloaded the .html file and then viewed it in my browser).
I then ran
dosbox
which opened a terminal window showing a Z:> prompt
At that Z:> Running
mount c /root/DOSBox-Win31-Newport/C
then enabled me to cd c: and I then ran
windows
and Newport started up/ran OK (the password is just press ENTER i.e. no password set)