Then, you can activate the license by following the steps below:
Copy the license key file (kendo-ui-license.txt) to the root folder of your application. This is the folder that contains the package.json file. (Alternatively, copy the contents of the file to the KENDO_UI_LICENSE environment variable.)
Install @progress/kendo-licensing as a project dependency by running npm install --save @progress/kendo-licensing or yarn add @progress/kendo-licensing.
Run npx kendo-ui-license activate or yarn run kendo-ui-license activate in the console.
For detailed information about the license activation, you can check the following article: