After you download and extract the HDRI texture, start Maya and drag the ".hdr" file to the Material Editor. Set the Color Space to "scene-linear Rec-709-sRGB" from the Property Editor > File Attributes.
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On the Arnold shelf tab select create Skydome light. Open Hypershade Editor and then drag the texture node by clicking and holding middle mouse button into the color texture.
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Go to Arnold shelf tab and select Arnold RenderView and render your scene.
