The trial key must be registered in your application code before any Syncfusion controls are initialized to avoid a "Trial Version" watermark or license validation error. Overview of Syncfusion license registration 25 Nov 2025 —

Ensure that the version of the NuGet/NPM package you installed matches the version for which you generated the key. For example, a v20 key will not work for a v21 package.

: Once you start a trial for a specific platform (like Angular, React, or ASP.NET Core), navigate to the License & Downloads section of your dashboard. Get License Key : From the Downloads & Keys