27 Nov 2008
30 Apr 2012
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Rakesh, theer is so much information on the licensing in these forums. I remember answering this same question on different forums at least three times. From you Telerik account, go to Manage Keys, and download the Sitefinity.lic file for the version that you are using. There will be a license key for all versions. Once you download the file, place it in the App_Data/Sitefinity where you will see a Sitefinity.lic file already. Delete the one already there and replace it with the one that you have downloaded. Then go into the Sitefinity Backend, and navigate to Administration -> Versioning & Licensing, and there click on the Refresh or Update buttons. It will pick on your new license file. Or it will ask you to enter your account credentials and get it from your telerik account itself.
Hope this helps,
Sorry, its Sitefinity.lic file not License.lic file. Sorry. Corrected the text too.