Hi Jinmin, Iray is an addon that requires an additional paid license. Alternatively, you can also look into SYNCHRO 4D licensing, that incorporates not only SYNCHRO Pro & Iray, but SYNCHRO Control, Field, and Modeler. Please reach out to your Bentley Account Manager for further details on it. If you do have Iray, you can enable the plugin, you can enable it by going to Options > Plug-in Modules - Iray
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