I just installed a Trial Version of ArcGIS. I was able to authorize it using the authorization code provided by ESRI. However, I could not use Geostatistical Analyst extension because it says 'Tool Not Licensed'. My question is do I need to purchase the license? I thought it is a free trial version. And the extension has been 'installed' and 'authorized' as per ArcGIS Administrator. Your help/thoughts will be greatly appreciated.