Ok, I started to post about this before, but decided it was too complicated and perhaps not useful to others.
With the help of the Internet, I came up with a Windows batch script that, with some side effort, was able to copy all my photos back out of PB and onto my hard drive; including the directory structure I had set up in PB.
The idea and process is the same as described here
https://gist.github.com/philipjewell/a9e1eae2d999a2529a08c15b06deb13d
I just encoded the process in a batch file (rather than bash script) and added my own twists to change the '%20' strings back to spaces; create the directory structure, and remove the '~original' from the file extension. I didn't get an accurate time, but I'd say it was less than 15 minutes for the entire 1100 photo process. (It doesn't always work, sometimes PB gives you a zero length file, so I had to run the script several times.)
To use it, you'll have to make a small change to my script, to reflect the length of your user name on PB (and perhaps which of their servers has your files on it). You'll also need to download and manually install an old shareware program; which probably means modifying environment variables and such.
Does this sound useful? Or am I off in geekville again?
If you're interested in taking a look, the script is at
https://drive.google.com/open?id=16FGqBYFdCQ5BiuFvJm4br1BLFlhDIjne
In line 42, the '51' is the magic number that you'll (probably) have to change.