If i have understood correctly, you can get the files, but one by one, so it will take a while. If you are wanting your product to be similar to the audio books people listen to, then there’s a fair bit of work to do, and almost certainly some re-recording of some bits. From past experience of a very short project like this, the critical bit is creating a naming system. The one I did was a short story, but in the end we had chapter, page, take, and a letter to indicate success. 2-23-4-G. Chapter 2 page 23 take 4 and G for G. As soon as we had a ‘G’ we moved on, and moved the other takes to a reject folder, just in case. We would then edit the G takes into a complete chapter, and move that to a different folder. Very often we would find mistakes missed later on, and need to re-record them. Because we recorded in batches we marked the floor with mic stand and chair position so the new recordings matched sound wise. I got involved because while reading, he found doing his own recordings very hard, and it created big gaps that took ages to edit out. With me starting stopping and spotting mistakes as they happened it was quicker but it took far, far longer than I expected, and I had not expected this. I guessed three days and quoted him based on that, and it took two weeks of six hours a day. Never again. He didn't get bored at all. For me, it was worse than waiting for paint to dry.
The good things is that your voice works and does not sound out of place. Your real loss I think is just time. Plus, you are listening to the story telling, and missing the other stuff. Odd gaps, noises, changes in your ‘tone’, the occasional missed plosive (poppy breath sound).
I guess you are now downloading like mad. Have you abandoned them as a distributor? Is it done? Or what?