Tree - Picea Pungens - Set Of 3 Coniferous Spruce Trees - Winter Version
To import into your scene go to File>Append, navigate to .blend files folder, open the file, open "Group" (v2.79) or "Collection" (v2.8 and higher) 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.
Or you can select it and copy it using CTRL+C and in your scene pressing CTRL+V.