That program must be more than 20 years old. I don't see any good reason to use it now. And I don't fully understand why you can't use it at the moment. What copyright issues?
Anyway, http://vetusware.com/download/PFS%20Professional%20write%20_/?id=4902 seems to have it in a zip-file and there's even somebody who said it runs under Windows 95 in a command window.
But I must warn you: when I visited that link, my antivirus (Avast webshield) popped up and warned me it had blocked the page. So I would play it safe and visit that site only after booting into a Linux distro or from a Mac.
Kees
Hello there,
I'm looking for Professional Write MS Dos to create subtitles file.
I do have this software actually. But Iam not able to use it due to some copyrights issues.
Hence, I wish to get it on my own for my own use.
Anybody?
Thank you.

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