@foone Pretty sure it was that one, maybe. By Arstech.
Looks like it wasn't a serial, just a download link I didn't have... I found the downloads (including special DOSBox) in a Vogons thread after looking again... Software last updated in 2013. 😌
EDIT: This guy: http://arstech.com/install/ecom-prodshow/usb2isax3.html
And software: https://www.vogons.org/viewtopic.php?t=76234