Why not get the Code Package and try using it with a lower version of the .NET Framework? I read a lot of code there, and few if any of them rely on .NET 3.5 features. If you use VS 2010, you may be able to create it against 2.0 or whatever you use without problems. The license allows you to integrate the code from the library into your project in order to modify it, so that you basically treat it as your own, so you have nothing to lose.
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