Exactly the same issue.
I've tried following the suggestions in the FAQ, tried downloading on different browsers (Chrome, Firefox, Edge, Safari) using different machines and different operating systems (Windows 7, Windows 10, MacOS, Linux) and all show the exact same behaviour, "Join to Download" when the screen is clearly showing that I am currently logged in.
I have also been trying this over the last 2 weeks, just in case it was a glitch for that day.

Any working suggestion is appreciated.