Is called eSword 9 Converter, and the details are found here. I had reason to give it a spin tonight as I finally upgraded the desktop eSword to v.9.9.1. I had a few modules no longer available and a few purchased ones that didn’t offer easy upgrade. So I downloaded converter, threw my old files into a special directory, pointed the converter at them, and voila! v9 ready files. It was that simple.
So if you can’t find v9 modules at Biblesupport.com or Catholic Apologetics esnips, don’t let an old esword module (one without an ‘x’ on the end) worry you. Get the converter and move on. Great software from Clint Branham!