If you are a developer trying to build or maintain a project, do not manually copy DLLs. Use NuGet:
: You try to upgrade to a newer version (like 10.0 or 15.0), but the old .rdlc report definitions refuse to open or break because version 9.0 used a specific XML schema that newer viewers often try to "auto-upgrade"—sometimes irreversibly. Official Download & Recovery microsoft.reportviewer.common version 9.0.0.0 download
) that installs the necessary DLLs (Common, WebForms, and WinForms) into the Global Assembly Cache (GAC) Alternatives for Developers If you are a developer trying to build
Last updated: 2025. Information accurate for Windows 10/11, Windows Server 2016-2022, and .NET Framework versions 4.6.2 through 4.8.1. Windows Server 2016-2022