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Syncfusion Licensing Runtime

Hi, I'm having the following issue: 


I need to make some changes in an application, that was created many years ago, but I don't have the source code (the person who create it don't work in the company anymore and we don't have the source code), so I have to use JetBrains DotPeek to decompile and recreate the code. But I don't know how to obtain the license key, and I don't know if I have to install Syncfusion in my development machine. The version of the Syncfusion.Core dll is 4.402.0.51. Can anyone help me. Thanks.

5 Replies

JM Jeyaseelan M Syncfusion Team March 10, 2023 12:07 PM UTC

Hi Dorian,

Essential Studio Setup v4.4.0.51 should be installed to use the Syncfusion.Core.dll


Please download the Syncfusion installer from the below link.


After downloading the setup, generate an unlock key to unlock the setup. Please refer to the below KB to know more about an unlock key.




Please ensure the below registry keys present in your machine after installing the setup, 


HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Syncfusion\Essential Suite\InstalledVersions 


Ensure Your unlock key is registered in the registry key below. 


HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Syncfusion\Essential Suite\InstalledVersions\Keys 





Could you please follow the steps provided in the documentation link to resolve the reported licensing issue in v4.5.0.51 version?


Regards,Jeyaseelan M

DO Dorian March 10, 2023 05:59 PM UTC

Thanks Jeyaseelan!! that fix the Licensing error. Now I have this other error: 

System.TypeInitializationException: 'The type initializer for 'Syncfusion.Windows.Forms.Tools.XPMenus.BarManager' threw an exception.'

Do you know how I can solve this. Many thanks.

KA Karthick Arjunan Syncfusion Team March 13, 2023 02:35 PM UTC


We will validate and update the complete details by tomorrow (March 14, 2022).

KA Karthick Arjunan Syncfusion Team March 15, 2023 02:01 PM UTC


We are still in the process of validating the reported issue and will provide a solution or complete details within two business days. (March 17, 2023).

KA Karthick Arjunan Syncfusion Team March 17, 2023 11:54 AM UTC


As per our product life cycle policy, we would like to let you know that your requested version was retired by 2012 itself. We are therefore unable to examine this problem in your requested version. And hence, we strongly recommend that you upgrade to the most recent version with the most improved features. And let us know if you need any additional assistance with this.

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