This video was relevant to old versions of the Adobe CC application. I will leave it here just in case you are using an old version of the App but in CC2017 it changed and you reach the Encore installer a different way. You still install it by installing Premiere Pro CS6 but that installer is easier to find.
This questions pops up all the time - how do you install Encore so you can make Blu-ray and DVD discs when you rent the Creative Cloud version? Essentially you install Premiere Pro CS6, but finding the installer in the Creatice Cloud application is not in the place where most people expect it to be.