Starting with version 16.4 (2018 Vol 4), Syncfusion has removed .NET
Framework 2.0, 3.5 and 4.5.1 assemblies from the Windows Forms install.
These assemblies are provided in a separate add-on install.
Please refer to this help topic for more information.
DBDilli Babu Nandha Gopal Syncfusion Team January 7, 2019 05:44 AM UTC
Thank you for your update.
As mentioned in our documentation, .NET Framework 2.0, 3.5, 4.5.1 and MVC3 assemblies and provide the separate Framework Add-On setup. This setup can be downloaded by customer with valid license and so it won’t available for customer with trail license.
Once installing Framework Add-On setup, you can find the Framework 2.0, 3.5 and 4.5.1 assemblies from the Syncfusion Essential Studio Platform installed location.