They are pretty efficient. That is all you need to do.
I've bought a studio 2014 freelancer license.
It displays as "available" in my SDL Account, but when I tried to activate it on my computer, an error message popped up: Cannot create license "LicenseNumberAlreadyUsed -23".
Then I tried to activate it offline, but only got another error message "There was a problem retrieving your activation certificate, please check your installation ID or contact support."
Please help me. what should I do?