Yes , on a Mac, same issue here...
When I try to log in I get the message I can't log on because I'm not using the required update then get redirected to the downloads page.
I must have checked the version number 100 times, but it is the exact same one as I have in my in my applications folder: the latest viewer update. Which worked fine until this issue popped up like 8 hours ago!
I have 3 Macs, did a fresh download & install of this "required" viewer on each one just to be sure, but the issue still remains.
Help!