I don't have a good answer for you, I'm afraid. I'm gonna be looking into alternative stores that still allow you to download the files. I've never worked with Kobo before, but I heard that that could work. Google Play can work. And there's always Anna's archive, that's kind of a last resort for me. I prefer to pay for high-quality copies than get some scanned low-quality version, but publishers don't want to sell me a file anymore.