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.

Picea_01_green               Picea_01_silver

Picea_02_green               Picea_02_silver

Picea_03_green               Picea_03_silver

Picea_04_green               Picea_04_silver

Picea_05_green               Picea_05_silver

Picea_06_green               Picea_06_silver

Picea_07_green               Picea_07_silver

Picea_08_green               Picea_08_silver

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