If your organization runs an internal line-of-business (LOB) application built with .NET Framework 3.5 or 4.0 and compiled against Report Viewer 2010, upgrading to a newer version (e.g., 12.0, 15.0) can break the application due to breaking changes in the object model or GAC binding redirects.
System.IO.FileNotFoundException: Could not load file or assembly 'microsoft.reportviewer.processingobjectmodel, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. If your organization runs an internal line-of-business (LOB)
The most reliable way to obtain this DLL is by installing the full runtime package. This ensures all dependencies, including the ProcessingObjectModel , are installed and registered correctly. upgrading to a newer version (e.g.