Say more, epubor team released a tool named Epubor Kindle Converter which works on kindle books downloaded via Kindle android app. But it requires you install an Android emulator on your windows or mac computer such as Android Studio. It's the unique available method to convert kindle kcr format books (kindle manga) to pdf on our Mac at current time. If you prefer to convert kindle manga or kindle photo books, don't hesitate to free trial it.