Install Visual Studio Extension for Telerik UI for ASP.NET AJAX on Visual Studio 2017

[Alan]

I am trying to upgrade Telerik UI for ASP.NET AJAX from R3 2021 SP1 (version 2021.3.1111) to the latest release 2025.1.416 to fix the CVE-2025-3600 vulnerability in our ASP.NET Web Forms application which is using the PDFViewer control. I am using Visual Studio 2017 to do this.

I used the Progress Control Panel to upgrade my Telerik UI for ASP.NET AJAX installed product to the latest version and it appears to have uninstalled the Visual Studio Extension for Telerik UI for ASP.NET AJAX in Visual Studio. I tried the Turn Features On/Off option for the product in the Progress Control Panel to re-install the extension, but it only gives me greyed-out options for Visual Studio 2019 Support and Visual Studio 2022 Support.

I also tried the stand-alone extension install from Visual Studio Gallery, but the VISX Installer fails with the message "This extension is not installable for any installed products". In the Install Log is says, "Extension is signed with an invalid certificate" and "The revocation function was unable to check revocation for the certificate".

I see at the following link...

Telerik Web Forms Visual Studio Visual Studio Extensions Overview - Telerik UI for ASP.NET AJAX

It says...

Visual Studio Extensions for Telerik® UI for ASP.NET AJAX are distributed with the Telerik® UI for ASP.NET AJAX installer. They can be downloaded and installed as separate product from the Visual Studio Gallery only for Visual Studio 2012 and later. The extensions support Visual Studio 2015, 2017, 2019 and 2022 handling .NET 4.5-4.8.1 projects.

...so I was expecting the extension to be compatible with Visual Studio 2017 still.

I would prefer to carry out an Automatic Upgrade in our application rather than a Manual Upgrade to ensure the upgrade is done correctly.

Can you help please?

Thanks.

[Rumen]

Hi Alan,

I would like to inform you that starting with our 2024 Q2 release, the Telerik UI for ASP.NET AJAX Extension for Visual Studio 2015 and 2017 has been officially deprecated. You can find this information on the Visual Studio Marketplace listing here and also in the image below:

To ensure continued support and access to the latest features and updates, we highly recommend upgrading to Visual Studio 2019 or 2022 and using the corresponding Telerik UI extensions for those versions.

Since no further updates will be provided for the Visual Studio 2015/2017 extension, continuing with those versions would require manually upgrading or installing the latest Telerik UI for ASP.NET AJAX via NuGet.

I hope this information is useful.

Regards,
Rumen
Progress Telerik