As of late 2025, it is important to note that a newer runtime, the , is available. While version 12.0.0.0 is stable, the 2015 runtime is technically the latest version of the 12.x family and may include bug fixes or performance improvements over the initial 12.0.0.0 release. It is usually available on the Microsoft Download Center .
If you are a developer needing the assemblies for a project: microsoft report viewer version 12.0.0.0 download
A: Ensure you installed the x86 version if your IIS application pool is set to 32-bit mode. Also, deploy the assemblies locally in the app’s bin folder if you cannot install to the GAC. As of late 2025, it is important to
Install-Package Microsoft.ReportViewer.WebForms.v12 -Version 12.0.0.0 If you are a developer needing the assemblies
While the 2012 runtime is stable, you may want to consider using the Report Viewer for Visual Studio 2022 or 2019 if you are working on a new project. Modern versions are delivered via NuGet packages and offer improved compatibility with newer .NET Framework versions and modern browsers. Frequently Asked Questions
If you do not want your end-users to manually install runtimes, you can choose .
Add the required HTTP handler configuration to your web.config file under the section: