That changes today, September 19, 2016, as we’ve received a tip from one of our readers that both the installation-only and Live ISO editions have been released on the official channels and are now available for download. Debian GNU/Linux 8.6 “Jessie” is only a collection of security and software updates, so existing users don’t need to download any ISO image to keep their installations up to date, just make sure that you have all the released updated packages installed from the stable repositories.