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.
Or you can select it and copy it using CTRL+C and in your scene pressing CTRL+V.
Is there any problem with this model or you would like to ask something?
Feel free to send email [email protected] if you have any questions about Blender.