Yes, ChainsawAsh is correct.

Those 83 rars are 83 pieces of one MASSIVE ISO file that is over 46 gigabytes. And you have to have all the pieces before you can extract anything. But once you have a folder full of parts 1-83, then you can use unarchiver, making sure to set the destination somewhere with about 50 more gigs of free space. Select the first rar of the batch (“Star Wars Despecialized 2.7 BD50.part001” in the case of the Star Wars Film Blu-ray) and start the extraction process. Your computer will recognize that it is part of a set and automatically extract all the rars. It will also reassemble them into the finished ISO file and save that to whatever you set for the extracted file to save to. That process will take about 30 minutes to an hour.

Oh, and remember, only download 10 at a time to get the best chance at completing each download session successfully.

But I think we found the problem! Keep at it man! You can do it!