Artisan registration question...

[McGyver]

I just downloaded Artisan (into Make 2015) and went to input my registration key, but the "Register" choice is greyed-out... It has been a long time since I last registered it (different computer).

Do I have to wait for the trial period to expire to use my actual registration key?
I dont remember that being the case...

Or could it be that because I transfered some of the plugins (Artisan included) from my old computer to a trial version of SU Pro 2013 on this computer... Although I dont recall registering Artisan in SU Pro 2013 (though its possible), could it be possible Artisan remained registered in the carryover?

I suppose the best person to ask is Whaat (sorry if that's misspelled), but I didnt want to bother him with what may be a simple stupid question.

Thanks in advance for any info or help on this subject.