Thanks for contacting Syncfusion support.
We have checked with tour query. We suspect that you have migrated the Syncfusion ASP.NET MVC application by manually. We suggest you to utilize the Syncfusion Migration Visual Studio Extension to migrate the Syncfusion ASP.NET MVC application from one Syncfusion version to another. Please refer the below link to know more about the Syncfusion Migration extension.
.NET Framework version-based assemblies
The assemblies based on the version of the .NET Framework are packed under the folders namely 3.5, 4.0, 4.5, 4.5.1, and 4.6 available in the above specified location. Some of the important assemblies available based on the .NET frameworks under each folder (3.5, 4.0, 4.5, 4.5.1, 4.6) are listed below,
MVC version-based assemblies
The assemblies based on the version of the MVC Framework (MVC3, MVC4, MVC5) are packed under the folder namely MVC available in the below location,
(installed location)\Syncfusion\Essential Studio\220.127.116.11\precompiledassemblies\ 18.104.22.168\MVC
For example, if you have installed the Essential Studio package within C:\Program Files (x86), then navigate to the below location,
C:\Program Files (x86)\Syncfusion\Essential Studio\22.214.171.124\precompiledassemblies\ 126.96.36.199\MVC
Some of the important assemblies available based on the MVC versions (within each folder namely MVC3, MVC4, MVC5) in the above specified location are listed below,
If still you are facing problem please get back to us with more that will help us to provide exact solution.