I assume you are using Visual Studio, and you are building LICE and IPlug using the and lice.vcxproj and IPlug.vcxproj project files. Both project files contain different build configurations you can choose from. For 32-bit you should choose Release|Win32, for 64-bit you should choose Release|X64.
If your main project also has these options, you can switch between 32- and 64-bit builds with a single click.
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