Just drag the "Your License" link into the box in the MovingPhotos3D options page, as in the picture below. If you haven't installed MovingPhotos3D yet, get it here. If this doesn't work, read on below, after the picture.
If dragging the link doesn't work, then download the license file using the same link. Drag the downloaded file to the same box in the options, as in the picture below. If this doesn't work, read on below, after the picture.
If dragging just isn't working, then you can follow this manual procedure:
If all this doesn't work, email movingphotos3d at gmail.com for help. My top priority is to assist you. Don't worry, you will be taken care of. Remember we may be in different time zones, and definitely check your junk/spam folder if you don't hear back!