You will need to install the latest version of Experience Builder - Developer Edition to your computer prior to installing the custom widget. For instructions on how to install please click here https://developers.arcgis.com/experience-builder/guide/install-guide/  

Copy the ‘xpgeo-3d-viewer’ folder and paste it into the following location: ArcGISExperienceBuilder\client\your-extensions\widgets

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When you are working on your experience, you will see the XPGEO 3D viewer Widget at the bottom of the widget panel, under the custom option.

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