I am reading these boards while the downloads are going in another browser. So, I can help! First, it wasn't working in my edition of Firefox for some reason. I launched IE and I could suddenly see everything. On the right side of the screen under All Photos are three buttons - click on the middle "Download Photos" button. It will pop up a "download everything" window, I hit yes, it took me to a page with a series of folders and said it would take some time until the pictures were "download ready" and the button would be enabled. I hit refresh after about 5 minutes and everything was enabled. I have about 10 folders and when I download them they are zipped. Extract into my photos folder and I'm good to go.
Sure beats the process two years ago, when I had to kick off the download before bedtime and it was still chugging along the next morning...