Hi future me,
Here's how I past me downloaded all of my Instagram photos easily. Remember, it doesn't download likes, comment, or any other information apart from the photos themselves.
For whatever reason Photoshop doesn't want to open the images but Preview works fine. It's the same when I manually downloaded the photos from the Instagram website. (Sabotage?)
And of course everyone else who isn't you will stop reading at this point and not use the instructions, right? Good. Now that it's just us...
- wget