ReSharper.ExternalAnnotations extension does not work in Visual Studio 2005/2008

Problem

• A string argument is not highlighted in String.Format, and there is no "Remove format item with index 0 and proper argument" quickfix in the Alt+Enter menu;
• ReSharper marks any NUnit test methods/classes as unused.

Resolution

Visual Studio 2005/2008 does not support ReSharper Extension Manager. You need to install ReSharper.ExternalAnnotations extensions manually to solve the problem:

1. Download nuget package;
2. Open it using any archiver software like WinZip;
3. Extract all folders from ..\ReSharper\vAny\annotations\ to C:\Program Files (x86)\JetBrains\ReSharper\v8.2\Bin\ExternalAnnotations;
4. Restart Visual Studio.