BeamNG.drive version 0.4.0.6, released on June 26, 2015, is a significant legacy build primarily known as the final official release to support DirectX 9 and Windows XP. Official Download Link
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The safest way to download BeamNG.drive is through its official website or legitimate digital distribution platforms like Steam. beamng drive 0406 download link
If you are looking for this specific build, you might be trying to run a legacy mod that hasn't been updated, or you are using older hardware. The 0406 build was notable for: BeamNG