CodeRush test runner for NUnit25 without NUnit installed.

What path is the Unit Testing\Test Runner options page expecting?
I have NUnit 2.5.9 downloaded from zip file, not installed from MSI and I try these paths and none of them work.
C:\Users\jrwren\Downloads\NUnit-2.5.9.10348
C:\Users\jrwren\Downloads\NUnit-2.5.9.10348\bin
C:\Users\jrwren\Downloads\NUnit-2.5.9.10348\bin\net-2.0
C:\Users\jrwren\Downloads\NUnit-2.5.9.10348\bin\net-2.0\framework

 

I get an error that says
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Error
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Test Provider ‘NUnit25’ can’t find required assemblies in this path
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OK  
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I finally tried C:\Users\jrwren\Downloads\NUnit-2.5.9.10348\bin\net-2.0\lib and it worked.

I didn’t see this documented anywhere. It is now. (here)