As mentioned in this link: Win32 prebuilt libraries - UE4 AnswerHub
I know it is not officially supported but it looks like it can be done. However I would like a more user-freindly way to install and run it in 32bit despite any performance concerns.
I would find this useful when I can’t always use a 64bit Desktop system. When I’m travelling or away I have a windows netbook/tablet at 32bit that I can already use to preview projects with UDK, Unity, Blender, etc. So I don’t think Unreal 4 should be an exception.
Mainly when using smaller devices it would be great for Blueprint creation, simulation and testing.
Alternatively an Unreal 4 Blueprint simulator App for mobile devices would be just as good.