Could you please install the latest version of Telerik UI for ASP.NET MVC Visual Studio extensions and give the upgrade another try? These steps will help you do that:
- Download Telerik UI for ASP.NET MVC extensions from Visual Studio Gallery
- Run the downloaded vsix file
- Choose your Visual Studio in the install window
- Click Install
Once the latest extensions are installed, you can run the upgrade wizard and try to download the latest version.
As another suggestion, you can always access and download your products from your Telerik account.
Please let me know if this helped.
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