You can not open a version 8 project in version 14. The programs are too different.
If you want to finish your version 8 project, you'll need to figure out how to get version 8 working again.
If you'd like to edit your project in version 14, you should restart it in version 14.
If your video project was finished in version 8 and you output a video of the finished project, you can import that video into version 14 by using Add Media/From Files and Folders. However, this video will be a finished video. You will not be able to take it apart change your editing to it as you could with a project file.