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.
- a plane with grass (particle system)
Or you can select it and copy it using CTRL+C and in your scene pressing CTRL+V.
Please note that this scene contains textures from Poliigon.com and Vitaly - Textures may not be redistributed
HDRI maps are from HDRI Haven