You can download an older version, (2.2.7.8 was the last version to target 2.0 .NET), or if you are an expert developer you can try to make your own 2.0 compatible build using the source code with Visual Studio by changing the target to 2.0 .NET for all projects curently targeting 3.5. Then you would have to exclude files or comment out code that doesn't build under 2.0.
Hope it helps,
Joe