Thank you for the quick reply!
I was already aware of the GitHub repo. Unfortunately the picture ch341aProB+.jpeg in the repo is identical to the picture ch341aProA+.jpeg of the repo/forum post. Sounds complicated, but there is just a duplicate file in the repo as well. I even checked the repo commits, but to no avail.
The picture ch341aProB+.jpeg of the repo is definitely different in appearance to the thumb of ch341aProB+.jpeg in the EEVblog forum post.
The EEVblog forum post might have been the only place where the real picture ch341aProB+.jpeg was uploaded correctly before the attachment scramble happened, thus it is most unfortunate that the download does not work.