actions, etc. -- just load them in CC, or copy them to the appropriate folders.
But Photoshop doesn't have "apps".
plugins generally need to be reinstalled (so they get all their support files). Also check with the plugin makers to see if they have updates for Photoshop CC.
By "apps", I meant things appearing under Automate, like Perfect Resize, Photomate, etc. All I know to call them is apps, since it sounds stupid to me to call them "automates". I should know, but I don't remember the nomenclature for them.
I guess I have to find the software producer names and go to their tech help, do I not?