License key can be obtained from the My Account >> License and downloads section of the Syncfusion website. To obtain a license key, you will need to have an active trial or license or community license.
This application was built using a trial version of Syncfusion Essential Studio. Please include a valid license to permanently remove this license validation message. You can also obtain a free 30 day evaluation license to temporarily remove this message during the evaluation period. Please refer to this help topic for more information.
Please note that this license key is different from the installer unlock key that you might have used in the past and needs to be separately generated from Syncfusion website.
Refer to this KB article to know more about difference between the Syncfusion Unlock Key and the Syncfusion License Key.