Trying to activate Unity free trial, but "(disabled) Activate a free 30-day trial of Unity Pro" comes up..

For future reference, this either means you’ve previously used the 30 day Pro Trial, or you’re running a Beta version. In which case, you should download the latest version, here: http://unity3d.com/unity/download/

i Havent used unity before … i mean this is first time ever i installed it on my PC !