I've been trying to use director on my iPad and, while it works, I find it hard on my eyes and back. Is there a way to get the Director on my desktop and edit my videos there?

No you cannot.  It is easier to load the video off the SD card and then edit.  There are many good ad free apps for video editing.

If you are using an Apple Mac then iMovie is great! If you are using wither an Apple Mac or PC you can download the GoPro Suite Software which is also very good for a free app.