Thanks, mesquitebean. Your suggestion didn't work, exactly, but it got me on the path to activation. By trying several times, from one scaling percentage to another, I got it so the cursor changed to a text entry cursor right in the license code field. Trouble was, when I typed, nothing appeared in the field. I typed the code anyway, blind, then clicked the Activate button. Nothing happened, but the activation window remained. I waited some seconds and clicked the Activate button again. Then it worked.
