how to I get my plug ins to work in the 2014 version?
Get compatible versions and installers from the vendors. Otherwise feel free to remove the "old" CC, just be aware that it may affect some shared components like Bridge and that you may need to reinstall CC 2014.
What Mylenium said. To add, when I uninstalled CC 14.x, things went a little kablooey (like missing scripts such as HDR Pro). Uninstalling and reinstalling CC 2014 made everything gravy again.