Note that anyone, with or without a Flickr account, can view and download original size versions via the down-arrow link on the far right side of an individual photo page.
That's not true for me. I cannot download without either signing in or registering. And a furthermore I cannot even register because that requires a cellphone number and I don't have one. I use a landline, which is quite sufficient for my needs.
Here's what I get when I click on the down arrow at far right:
You found a photo to download!
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There is nothing that allows me to go past that screen.
I'm astounded that anyone should expect everyone to have a cellphone. Have they never heard of poor reception areas? There are plenty of them in New Zealand. If they are so ignorant that they've never heard of such a thing, they should come to where I live and try using their cellphones.
So long story short, other than allowing me to view the photos, Flickr doesn't work at all for me, and that is bloody annoying.