Dear Ladies and Gentlemen

Currently I am trying in vain to upgrade to the latest version Telerik UI for WinForms 2022.1.118.
However, the update fails with the error given below.

I have already uninstalled and reinstalled VS2019. Unfortunately this did not help.

Can you help?

Best Timo

To reproduce: please refer to the attached sample video

1. Uninstall the already existing version of the Telerik UI for WinForms suite. Ensure that you don't have any installation and the Telerik menu is not visible in Visual Studio.
2. Open Visual Studio >> Tools >> Extensions and Update and search for Telerik WinForms VSExtensions. Install it.
3. After restarting Visual Studio, create a new Telerik project. You may be prompt to download the latest version during the creation process. 
4. Run the Toolbox configurator in order to obtain the proper version in the toolbox.
5. After the project is created, open the form's designer and drag a Telerik control from the toolbox and drop it onto the form. Open the Designer.cs and you will notice that control's declaration is inside the InitializeComponent method, not outside as expected.

The issue is not reproducible each time you follow the steps. It was reproduced with Visual Stidio 2012 on Windows 10. 

Workaround:

Download the Telerik UI for WinForms msi from your account and install the suite.

I have updated my OS to Win 10 from Win 8.1 and now none of the RadForms will open in VS 2015 Designer. Some esoteric error message: "Value cannot be null. Parameter name: instance" is displayed. Is there something I could do other than re-installing the entire Telerik product line? 

Lajos Szoke

Upgrade utility miss to change the TelerikData.dll reference. In result, the reference remains pointing to older version of that assembly, which could lead to unexpected exceptions.

Resolution: The issue is no longer reproduced. In Q3 2011 we introduced Upgrade Wizard which replace the Update Utility. 

We just upgraded our WinForm UI from Q3 2013 to Q2 2014 and we started getting a "An unhandled exception of type 'System.TypeinitializationException' occurred in unknown module" before our 'Main' method is ever hit in Program.cs. This didn't occur when we referenced the Q3 2013 assemblies. I've attached the error and our reference list from Solution Explorer in VS 2013 Update 2.