If you need Encore, you need to have Premiere CS6 installed. Or, you could start the uninstaller app for Premiere, and deselect Encore. This will uninstall Premiere, but leave Encore.
I'd also recommend keeping Premiere CS 6 around until all the "legacy" projects you're working on are well and trully finished. Unless you like that feeling of uncontrolled panic, I would recommend *NOT* porting a bunch of "in progress" work over to Premiere CC!
I've got one, rather complicated project, that I'm working on and I think CC will make it easier but, rather than risk all the work I've already done in CS6, I've copied the whole thing over to an external drive and renamed the project so I can always, easily, go back if CC gives me trouble