Download one of the following zip-files. Unzip it. Add either BLToolkit.2.csproj (FW 2.0: VS 2005, VS 2008) or BLToolkit.3.csproj (FW 3.5: VS 2008) project into your solution. Add project references where you need it. Compile. Enjoy.
<% ..\..\..\Source\Doc\ChangeLog.txt %>