Thank you for the suggestion. Unfortunately, it didn’t help. I cleared my cache (and history and cookies) in Vivaldi, deleted the existing install, and installed it again. But still nothing happens when I click that link. I then deleted the install again, opened Firefox (which I had not used for this before), and installed it again. Still, no response from clicking the “Don’t have a connect key” link.
So I deleted the plug-in again, quit Firefox, opened Safari (I’m on a Mac), cleared the cache, went to my dashboard, installed the plug-in again, activated it, and tried to click on that link. Still no response. The cursor turns into a hand when I hover over the link, but nothing happens when I click. Frustrating; further suggestions welcome.