Yes, Kindle cloud reader has updated recently. Please just download the latest version of Epubor KCR converter to handle kindle cloud reader books:https://www.epubor.com/kcr-converter.html
For downloading kindle cloud reader books, please just click the book cover to open this kindle book, and a downloading progress bar will show at the bottom-right corner. Just keep this book open until this the downloading is finished. Restart kcr converter to convert kindle cloud reader books.
