How remove a link from a PDF?

I have about 15 PDFs that contain links to several about 15 external videos each  - PDFs that were done when Adobe's video player was still in a priimitive state. Now that Adobe's video interface has improved, I want to re-do these links to get the newest Adobe interface but I find this to be inmpossibe without REMOVING the links that are already there.  But the usual way I've found to remove links (right-click on it to see options that include "delete link") does not work. Instead, I see only the choices "Enable content", "Save Video", and "Properties", and when I chose "Properties" it simply gives me a dialog where I can CHANGE its properties, but none where I can delete the attached video so I can add it back and thus benefit from Adobe's improved video interface. If I simply left-click on the icon that I've linked the video to, it just opens the video in the old interface (the crippled one that existed back when I originally linked it).