Can't seem to enter a license key

Hello. I’m trying to run the evaluation version of Rhino3D 7 for a workshop McNeel is soon hosting, but alas, every time I try to add the license, and it seems to do so using the registration key sent to me in an email. I get a message that there’s no license.

What am I doing wrong?

Hello - what is the exact message that you get?

-Pascal