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Upgrading from Trial to Licensed Version of Telerik UI for ASP.NET AJAX

Environment

Product	Progress® Telerik® UI for ASP.NET AJAX
Version	all

Description

This article explains how to activate a licensed copy of Telerik UI for ASP.NET AJAX after using a trial version, based on the version you're working with.

The trial version of Telerik UI for ASP.NET AJAX is intended for evaluation purposes. Once you decide to use the product for development, you must activate or upgrade to a licensed version. Starting with the 2025 Q2 release, Telerik has introduced a unified distribution for trial and commercial packages, simplifying this process.

Solution

For Telerik UI for ASP.NET AJAX 2025 Q2 and later

Telerik UI for ASP.NET AJAX now uses a unified package for both trial and licensed users. You do not need to download a separate licensed package. Instead, you activate your license with a key file.

Ensure you have the 2025 Q2 (or later) version installed.
Add or update your license key file as described in the Setting Up Your License Key File guide.
Clean and rebuild your project to ensure the license is applied correctly.

If you're still seeing trial messages after applying the license key, refer to the Licensing FAQ for troubleshooting guidance.

For Telerik UI for ASP.NET AJAX versions prior to 2025 Q2

In older versions, the trial and licensed assemblies are separate. To upgrade:

Download the licensed version of Telerik UI for ASP.NET AJAX from the Telerik website.
Remove all references to the trial assemblies from your project.
Add references to the licensed assemblies from the downloaded package.
Follow the detailed steps in the Upgrading a Trial to a Developer License or to a Newer Version documentation.

You should also uninstall the trial version from your system to avoid mixing assemblies.