Adobe Digital Editions v4.0 was released few days back. You can download the application by clicking here: Download ADE v4.0
Our eBook conversion services team tested ADE v4.0 extensively and have bring few limitations for you to consider before you run off to download and install:
Above are so important functional limitations that we do not recommend installing ADE V4.0 on Windows (until it got improved further), as you can’t trust this version to quality check EPUB3 ebooks. Our eBook conversion expert team has decided not to use this release to test and quality check EPUB3 ebooks for our clients and we would keep continue iBooks for mavericks and Readium to QA EPUB 3 files where possible.
Please let us know if you are also doing testing on ADE V4.0 or post your questions/comments regarding ADE V4.0, if any.