Rhino on ElCapitan asking for Licence Key

I installed the Evaluation version of Rhino for Mac this morning. But while running it, it asked for the licence key. Does the evaluation version not work with Mac ?

You should have been sent an Evaluation licence key when you requested the download link. Please double check your spam folder and let us know which e-mail address you did use in your request in case you didn’t receive it. You can reach us directly at: tech@mcneel.com