Photometry - Image brightnesses differ significantly, with the right-eye image being about 25% brighter.
Image Registration - There is no misalignment between images, but the right eye image is smaller vertically (by 16 lines at the bottom and 12 at the top).
Pressing the "Download" button will send a .tar file to your machine. The .tar file is not compressed because the images already are. You will need tar to decompress the archive. Any additional information (such as ground truth) will be included in the archive.
Note - the resulting file will be called 'maketar.pl'. Just rename it when you download it and extract it.
Finally, it can take a bit of time to tar up everything for download. Don't quit because it doesn't immediately return.