To import into your scene go to File>Append, navigate to .blend files folder, open the file, open "Group" folder, then double-click on the name of the group and append.
The name of the model and the name of the group is the same. Every variation is in the separate layer.
Please note that this scene contains textures from Poliigon.com and pixabay.com - Textures may not be redistributed
HDRI maps are from HDRI Heaven