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all Telerik ASP.NET AJAX controls and versions
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The shortest list of steps for upgrading the version of the Telerik UI for ASP.NET AJAX (formerly known as RadControls for ASP.NET AJAX) is available in the Upgrade the Version of Your Telerik ASP.NET Controls in 6 Easy Steps blog post.
If you need more detailed instructions, examine the Upgrading a Trial to a Developer License or to a Newer Version help article.