For a long time the images needed for the solution have been unavailable. Thanks to a cacher who saved the images a long time ago I got the images, so if anyone wants to solve the mystery, here they are (without any added spoilers):
Listing (roadofangels.jpg): https://i.imgur.com/kq3JvW7.jpg
Background (wayofangels.jpg): https://i.imgur.com/dsYqB1b.jpg
One more problem is that at a certain point in the solution, the web https://web.archive.org needs to be used, as the piece of information required for the solution has also slightly changed and doesn't work in current form. (I have verified that archive.org really contains the needed info)
The whole mystery needs a revitalization which might take just a few minutes from owner's side, but it seems the owner has been inactive for a long time.