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V-Ray 5 for SketchUp licenses also work with V-Ray Next, allowing anyone who purchases an upgrade to complete unfinished projects using V-Ray Next if needed.
Lights
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The Portal Light option in V-Ray Rectangle light is now a legacy option and is no longer exposed in the UI. Rectangle lights in files saved with previous V-Ray versions and this option enabled will still have it available. Regardless, for best performance consider disabling it and using the Adaptive Dome Light option instead.