A comment by Klaus
Thanks a million for this script!
It took me some attempts to make it work, as I was not sure about the exact format of the cookie line in creds.yaml. It needs to look like:
cookie: koa_re=...
(The koa_re part might be different for you, but you do not need the ">" from the example file.)
It should work copying "all", not just the value when seeing the cookie in your browser.
To get the cookie, make sure to look at http header data, not "cookies" in Firefox,
The actual download take quite long - I see 7-8 tracks per minute, of course depending a lot on the amount of pictures included. Make sure your computer doesn't go into suspend during that time...
Sharing this here in case others struggle as well.