With the new subscription model, Encore is no longer updated with the other Creative Cloud apps. While installing applications, there is no option to download Encore CS6, which is the last version of this program to be available.
The CS6 applications are still available are part of a Creative Cloud membership. These applications include Encore CS6, which is part of the Premiere Pro CS6 installation.
This document describes the process of installing Encore CS6.
Note: The ability to install CS6 applications is only available for paid subscribers and not available with trial memberships. It is not possible to install Encore CS6 with a trial membership to Creative Cloud.