Hi HW,
This has worked for me, using Opera Browser on a Windows 10 laptop. I tested it 3 times to be sure, after first having thought I had it but didn't.
Logged into the member's site. then selected JRA magazine index.
When this opened, I found newsletter 56 and right-clicked on the title.
This brought up a dialog box "open in new tab". Left clicked on that and it opened a new tab on my browser in which the entire Newsletter 56 opened.
That took a while though, (probably due to my using my mobile phone as the wifi hotspot, so slow enough).
While the newsletter was downloading into the new tab, the image was sort of faded and only when the file was fully downloaded, did the image sharpen up to more photographic/magazine quality.
At that point, I clicked the download button in the top right corner and the magazine downloaded into my downloads file. Again this took a while. (Prob due to my wifi speed)
I also noticed that the download button will not function until the newsletter is fully loaded onto the browser tab. (The sharp clear image rather than the washed-out one).
Found the newsletter in my downloads file, opened it and when it had fully opened, saved it into my JRA magazine file on the computer.
It might be that slow download is fooling you into thinking that nothing is happening. It took a little while for the message showing speed and extent of download to display on my screen, so that may possibly putting you astray.
Maybe this method will work on your own browser without having to download Opera.
Cheers. Not fish nor fowl